The catalytic activities of TiSiW_(12)O_(40)/TiO_2 in synthesizing ethylester; propyl ester, n-butyl ester; and amyl ester were reported. It was demonstrated thatTiSiW_(12)O_(40)/TiO_2 is an excellent catalyst. Variou...The catalytic activities of TiSiW_(12)O_(40)/TiO_2 in synthesizing ethylester; propyl ester, n-butyl ester; and amyl ester were reported. It was demonstrated thatTiSiW_(12)O_(40)/TiO_2 is an excellent catalyst. Various factors concerned with esterification wereinvestigated. The optimum conditions were found: the mole ratio of alcohol to acid is 1.3:1, themass ratio of catalyst to reactants is 1.5 percent, and the reaction time is 1.0 h. Under theoptimum conditions, the yields are 88.0 percent for ethyl ester, 94.5 percent for propyl ester, 98.6percent for n-butyl ester, 99.1 percent for n-amyl ester, and 96.7 percent for iso-amyl ester,respectively.展开更多
As an emerging class of crystalline porous materials, covalent organic frameworks（COFs） have been widely used as catalysts or catalyst supports. Flexible regulation of the pores and easy introduction of functional a...As an emerging class of crystalline porous materials, covalent organic frameworks（COFs） have been widely used as catalysts or catalyst supports. Flexible regulation of the pores and easy introduction of functional active sites onto the skeleton of COFs make them promising platforms for many catalysis applications. However, only a single function is generally observed in these COFs. Herein, we synthesized a negatively charged ionic COF（I-COF） and successfully incorporated functionalized counter ions, that is, metallic Mn2＋ and a coordination complex of manganese（Ⅱ） bipyridine complexes（[Mn（bpy）2]2＋）, via a simple ion exchange process. The resulting I-COFs can act as effective heterogeneous catalysts for epoxidation reactions. We envisage that with this type of ionic architecture, a variety of other functional cations could be exchanged into the frameworks, thus making the COF a versatile platform for different applications.展开更多
Linear porphyrin-thiophene copolymers were synthesized by linking 5, 15-positions of porphyrin with tetrathiophene or bithiophene moieties for preparing conducting polymer. 2,8,12,18-tetraethyl-3,7,13,17-tetramethyl-5...Linear porphyrin-thiophene copolymers were synthesized by linking 5, 15-positions of porphyrin with tetrathiophene or bithiophene moieties for preparing conducting polymer. 2,8,12,18-tetraethyl-3,7,13,17-tetramethyl-5, 15-dithienylporphyrin4a (45.1%), 5, 15-di-bithienyl- 2,8,12,18-tetraethyl-3, 7, 13, 17-tetramethylporphyrin4b (61. 2%) and their metal complexes were also reported in high yields (>90%) as the monomers. 5, 15-di-bithienylporphyrin and its metal complexes could be polymerized by oxidation using FeCl3 as oxidant. However, 5,15-dithienylporphyrin and its metal complexes can not be polymerized by same reaction. Their polymers were synthesized by electrochemical oxidation on the gold-plate electrode. The structures of copolymers were identified by elemental analysis and IR spectra. And the conductivity of poly 5,15-di-bithienylporphyrin was measured to reach over 1.0× 10?6S/cm. Key words organic conductor - thienylporphyrin - porphyrin-thiophene copolymer - electropolymerization CLC number O 62 Foundation item: Supported by the National Natural Science Foundation of China (29872033, 20272046)Biography: CHEN Zhang-ping (1946-), male, Professor, research direction: porphyrin chemistry.展开更多
The thermal decomposition processes of ephedrini hydrochloridum and its kinetics are studied by TG-DTG techniques. A combined method, which includes Achar method, Coats-Redfera method, and Ozawa method, is put forward...The thermal decomposition processes of ephedrini hydrochloridum and its kinetics are studied by TG-DTG techniques. A combined method, which includes Achar method, Coats-Redfera method, and Ozawa method, is put forward for determining kinetic model under non-isothermal conditions. By applying the combined method, it is determined that the thermal decomposition of ephedrini hydrochloridum is subjected to cylindrical symmetric diffusion. And the reaction function isƒ(α)=2(1-α)?, apparent activation energy (115.26±3.55) kJ·mol−1, pre-exponential factor 4.62×108 s−1. Results show that the combined method is feasible and simple.展开更多
We synthesized and characterized photoactivatable phospholipidic probes 1-3. These probes have the perfluorinated aryl azide function at the polar head of phospholipid. They are stable in dark and become highly reacti...We synthesized and characterized photoactivatable phospholipidic probes 1-3. These probes have the perfluorinated aryl azide function at the polar head of phospholipid. They are stable in dark and become highly reactive upon photoirradiation. The preliminary results suggest that they are promising tools to study the topology of membrane proteins and protein-lipid interactions using photolabeling approach.展开更多
A new kind of porous nano-'IiO_2 composite films was prepared on the glasssubstrate with the water glass as binders and the sodium fluorosilicate as solidifying reagent. Themorphologies of the films were studied b...A new kind of porous nano-'IiO_2 composite films was prepared on the glasssubstrate with the water glass as binders and the sodium fluorosilicate as solidifying reagent. Themorphologies of the films were studied by scanning electron microscope(SEM).The UV-Visspcctiophotometer was also used to investigate the absorption of the films. The gas-phasephotocatalytic oxidation of nitrogen oxides on the composite film was carried out in Ti0_2/UVsystem, and some important factors affecting the photocatalytic oxidation were also studied such asthe catalyst concentration, vapor pressure and the presence of oxygen. The results showed theconversion of NO_x reached 97.5% alter 2 h UV-irradiation. The final product of photo-oxidation wasdetected to be HNO_3 by FT-IR. The way of photocatalytic oxidation of NO_x was possibly useful inthe practical application.展开更多
The photodegradation of 17α-ethynylestradiol (EE2) induced by highpressure mercury lamp (λ≥313 nm, 250 W) in aqueous solution with algae (e. g.Nitzschia hantzschiana andChlorella vulgaris) and Fe3+ was ineestigated...The photodegradation of 17α-ethynylestradiol (EE2) induced by highpressure mercury lamp (λ≥313 nm, 250 W) in aqueous solution with algae (e. g.Nitzschia hantzschiana andChlorella vulgaris) and Fe3+ was ineestigated initially. The affecting factors on the photodegradation were studied and described in details, such as algae concentration, Fe3+, exposure time, and so on. The concentration of EE2 in distilled water was determined using fluorescence spectrophotometer. The photodegradation of EE2 in aqueous solution exposed to 250 W high-pressure mercury lamp was evident in the presence of algae and Fe3+. With the algae concentration increasing, photodegradation rate increased. Fe3+ could accelerate the photocatalytic degradation of EE2 in aqueous solution with algae. The colloidal ferric hydroxide particles that might have absorbed on the algae cells could enhance the photocatalytic degradation of EE2 by algae. The catalysis in photocatalytic degradation reaction mainly resulted from the active oxygen (H2O2,1O2 and ·OH) that was caused by algae and Fe3+ under 250 W HPML. In this paper, the mechanism of photocatalytic degradation of EE2 by algae and Fe3+ is discussed theoretically in details. Key words 17α-ethynylestradiol - photodegradation - high-pressure mercury lamp - Nitzschia hantzschiana - Chlorella vulgaris - Fe3+ CLC number X 131. 2 Foundation item: Supported by the Scientific Research Foundation of Wuhan Environmental Protection Bureau and the National Natural Science Foundation of China (20177017)Biography: Liu Xian-li (1965-), male, Ph. D candidate, Associate professor, research direction: environmental chemistry展开更多
A novel supramolecular adduct 3(C 42H 42N 28O 14) 2·H 2O (1) was synthesized by mixing 2- and cucurbit uril in solution of hydrochloric acid. The crystal structure was determined by single crys...A novel supramolecular adduct 3(C 42H 42N 28O 14) 2·H 2O (1) was synthesized by mixing 2- and cucurbit uril in solution of hydrochloric acid. The crystal structure was determined by single crystal X-ray diffraction analysis. The crystal belongs to orthorhombic system and space group F dd2 with cell dimensions: a=4.705 33 (5) nm, b=7.153 80 (6) nm, c= 1.894 61 (2) nm, Z=16, V=63.7744 (11) nm3, D c= 1.534 g/cm3, μ=3.007 mm -1, F(000)=29 120, R 1= 0.070 7, wR 2=0.169 2. In crystal, the cucurb uril molecules form two zig-zag chains.展开更多
Molecular imprinting of theophylline in poly (methacrylic acid- ethylene dimethacrylate) as CEC stationary phases was synthesized by an in situ photo-initiated polymerization reaction. The effect of electrolyte pH on ...Molecular imprinting of theophylline in poly (methacrylic acid- ethylene dimethacrylate) as CEC stationary phases was synthesized by an in situ photo-initiated polymerization reaction. The effect of electrolyte pH on xanthine derivatives and the stability of MIP column performance were investigated. the relative standard deviation (D RS) of migration time of five consecutive runs on MIP column was in the range of 2.2%–3.1%. The reproducibility of migration time column to column of M(A) was in the range of 3.8%–4.9%. The highest column efficiency was more than 140 000 plates per meter. The MIP capillaries had showed better selective for theophylline, which comparing with the reference column. The urine sample was separated by spiked 5×10?4 mol·L?1 theophylline. Key words capillary electrochromatography - molecular imprinting polymers - theophylline CLC number O 657.8 Foundation item: Supported by the National Nature Science Foundation of China (20375028) and the Research Fund for the National High Technology Development “863” of China (2002AA2Z2004)Biography: Cai Ling-shuang (1968-), female, Associate professor, Ph. D, research direction: separation science.展开更多
Twenty Yongzheng copper coins were fast dating by X-ray energy dispersive spectrometer with scanning electron microscope (SEM-EDS) according to official ingredient. The 20 coins were classified in two groups according...Twenty Yongzheng copper coins were fast dating by X-ray energy dispersive spectrometer with scanning electron microscope (SEM-EDS) according to official ingredient. The 20 coins were classified in two groups according to the results. Group 1 represents the coins minted before AD 1 728 and group 2 represents the coins minted after AD 1 728. At concentration range (0.00%–5.13%), the distribution of lead is not homogeneous in the coins, and the largest diameter of lead inclusion is less than 15 μm. The official fineness degrade is supported. Key words archaeometry - Yongzheng coins - dating - SEM-EDS CLC number O 69 - K 854.2 Foundation item: Supported by the Project of Instrument Upgraded of Ministry of Science and Technology of ChinaBiography: Lei Jun-feng (1975-), male, Ph. D, research direction: numismatic archaeology and instrument analysis.展开更多
A simple and highly sensitive method for the determination of triamcinolone acetonide in pharmaceutical formulations is presented. The approach is based on the fluorescence of production of triamcinolone acetonide oxi...A simple and highly sensitive method for the determination of triamcinolone acetonide in pharmaceutical formulations is presented. The approach is based on the fluorescence of production of triamcinolone acetonide oxidized by concentrated sulfuric acid. The effect of H2SO4, β-cyclodextrin (β-CD), solvent and cetyltrimethylammonium bromide (CTMAB) were discussed. And two analytical systems were established. One is CTMAB system, the linear range is 0–4.6×10?6 mol/L, and the detection limit is 3.59×10?8 mol/L. The other is β-CD and ethanol system, the linear range is 0–2.3×10?6 mol/L and the detection limit is 1.91×10?8 mol/L. The selectivity of analysis, the analytical figures of optimization, and the accuracy of the method are demonstrated with the determination of triamcinolone acetonide in pharmaceutical preparations. Key words triamcinolone acetonide - fluorimetry - CTMAB - β-cyclodextrin - pharmaceutical analysis CLC number O 657.39 Foundation item: Supported by the National Natural Science Foundation of China (20275028)Biography: Pan Zu-ting (1945-), male, Professor, research direction: analytical chemistry.展开更多
Poly (N, N, N-trimethyl-(2-pyrrol-1-yl) ethyl ammonium iodide)/V2O5 (PTPAI/V2O5) nanocomposites were synthesized by sol-gel method. This method involved formation of vanadium pentoxide xerogel in the presence of polyp...Poly (N, N, N-trimethyl-(2-pyrrol-1-yl) ethyl ammonium iodide)/V2O5 (PTPAI/V2O5) nanocomposites were synthesized by sol-gel method. This method involved formation of vanadium pentoxide xerogel in the presence of polypyrrole derivatives solution. X-ray diffraction (XRD) indicated that the polypyrrole derivative particles encapsulated in the fibrous V2O5 network and the layered distance significantly increased from 1. 077 39 to 1. 354 56 nm. The interaction between polypyrrole and V2O5 in the ‘nanocomposites’ was characterized by IR spectroscopy. The Scanning Electron Microscope (SEM) micrographs reveal the structural contrasts between the hybrid materials and the pristine vanadium oxide xerogel. Key words polypyrrole/V2O5 - nanocomposites - XRD - SEM CLC number O 633. 5 Foundation item: Supported by the Natural Science Foundation of Hubei Province (2003ABA030)Biography: Shi Chuang (1978-), male, Master candidate, research direction: synthesis chemistry.展开更多
Ribavirin has been used in urgency to treat SARS patients recently. In order to study its antiviral mechanism by photolabeling approach, we have synthesized and characterized 5-azido-1-β-D-ribofuranosyl-1,2,4-triazol...Ribavirin has been used in urgency to treat SARS patients recently. In order to study its antiviral mechanism by photolabeling approach, we have synthesized and characterized 5-azido-1-β-D-ribofuranosyl-1,2,4-triazole-3-carboxiamide 1 as a photolabeling probe of ribavirin. The azidotriazole nucleoside showed rapid and clean photochemical reaction, suggesting that l is a promising probe to study the antiviral mechanism of ribarivin by photolabeling.展开更多
Lanthanum complex crystal with β alanine (1∶3) was synthesized. Through the DTA,TG,chemistry analysis and comparison with literature, it shows that its form is {[La 2(β ala) 6· (H 2O) 4](ClO 4) 6·...Lanthanum complex crystal with β alanine (1∶3) was synthesized. Through the DTA,TG,chemistry analysis and comparison with literature, it shows that its form is {[La 2(β ala) 6· (H 2O) 4](ClO 4) 6·H 2O} n , and its purity is 98.86%. The dissolution enthalpy of the reactants and products in 2 mol·L -1 HCl solution (298.15K) was measured by using the isoperibol reaction calorimetry. Δ rH m was calculated by a designed thermochemical cycle of the coordination reaction. From the results and other auxiliary quantities, the standard molar enthalpy of formation of [La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O is obtained to be Δ fH m°{[La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O} = - 7062.911 kJ·mol -1 .展开更多
Ni(II)-dien complex was prepared and characterized by X-ray diffraction. The crystal belongs to triclinic system, space group P-1, with crystallographic parametersa=0.888 13(18) nm,b=0.890 10(18) nm,c=1. 591 8(3) nm, ...Ni(II)-dien complex was prepared and characterized by X-ray diffraction. The crystal belongs to triclinic system, space group P-1, with crystallographic parametersa=0.888 13(18) nm,b=0.890 10(18) nm,c=1. 591 8(3) nm, α=77.71(3)°, β=89.12(3)°, γ=61.24(3)°,Z=2. The two dien molecules coordinate to the central Ni atom, the six nitrogen atoms form a distorted octahedron. Preliminary pharmacological tests showed this complex had antitumor activity against HepG2 and HL-60 cell linesin vitro. Key words polyamines - Ni(II) complex - crystal structure - antitumor activity CLC number O 626 Foundation item, Supported by the National Natural Science Foundation of China (29972034)Biography: Li Tao (1976-), male, Ph. D candidate, research direction: ophthalmology and chemicalbiology.展开更多
The Eu^(3+)-doped Na^(24)As_2W_(22)O_83 phosphor has been prepared by solidstare reaction from Na_3AsO_4.12H_2O, Na_2WO_4.2H_2O and WO_3, and characterized by elementalanalysis, infrared spectroscopy and powder X-ray ...The Eu^(3+)-doped Na^(24)As_2W_(22)O_83 phosphor has been prepared by solidstare reaction from Na_3AsO_4.12H_2O, Na_2WO_4.2H_2O and WO_3, and characterized by elementalanalysis, infrared spectroscopy and powder X-ray diffractometry. According to the measurements withX-ray diffraction, this material belongs to orthorhombic system with its lattice constants: avelence 1.4750 nm, b velence 1.1944 nm, c velence 1.1062 nm, it is consistent with space groupD_2~4-P2_12_12_1 (No.19). The emission and excitation spectra were measured. The luminescentproperties of Eu^(3+)-doped Na^(24)As_2W_(22)O_83 and mechanism of energy transfer were discussed.展开更多
A new bridging reagent, N,N ′\|bis(chloroacetyl)propylenediamine was used to explore the relative activity and bridging pattern of p \|tert\|buty lcalix\arene, p \|tert\|buty lcalix\arene and butyl...A new bridging reagent, N,N ′\|bis(chloroacetyl)propylenediamine was used to explore the relative activity and bridging pattern of p \|tert\|buty lcalix\arene, p \|tert\|buty lcalix\arene and butylcalix\arene. It was found that the bridging reaction is selectively, at least, preferably at 1,3\|position for p \|tert\|butylcalix\arene and p \|tert\|b utylcalix\arene, 1,5\|position for p \|tert \|butylcalix\arene. Taking the yield of bridged calixarene as a comparsion standard, the activity decreases with the increasing of the number of phenolic units in calixarene.展开更多
Three different spin-lattice relaxation times ( T_1) of water were obtainedin activated alumina-water slurry system, which indicate that there exist three states of water;bound water, pore water and bulk water. The ch...Three different spin-lattice relaxation times ( T_1) of water were obtainedin activated alumina-water slurry system, which indicate that there exist three states of water;bound water, pore water and bulk water. The chemical shift (delta_H) decreasesas the amount of wateradded to the system increases due to the differences in contribution of these three states of waterin the samples. The delta_H value for adsorbed water decreases nearly linearly and T_1 increaseswith elevating temperature, whichresult from the decrease in the content of bound water by theincrease in thermal motion.展开更多
The geometries of the molecules of eight organic additives were optimized and the net charge,E HOMO andE LUMO were obtained using AM method, respectively. The result shows that there is the correlation between the lev...The geometries of the molecules of eight organic additives were optimized and the net charge,E HOMO andE LUMO were obtained using AM method, respectively. The result shows that there is the correlation between the leveling property and the frontier orbital energy levels of these additives, and the adsorption models and leveling mechanics were discussed. The rule between the frontier orbital energy levels and the leveling property is verified by the experiments.展开更多
文摘The catalytic activities of TiSiW_(12)O_(40)/TiO_2 in synthesizing ethylester; propyl ester, n-butyl ester; and amyl ester were reported. It was demonstrated thatTiSiW_(12)O_(40)/TiO_2 is an excellent catalyst. Various factors concerned with esterification wereinvestigated. The optimum conditions were found: the mole ratio of alcohol to acid is 1.3:1, themass ratio of catalyst to reactants is 1.5 percent, and the reaction time is 1.0 h. Under theoptimum conditions, the yields are 88.0 percent for ethyl ester, 94.5 percent for propyl ester, 98.6percent for n-butyl ester, 99.1 percent for n-amyl ester, and 96.7 percent for iso-amyl ester,respectively.
基金supported by the National Natural Science Foundation of China(21473196,21676264)the 100-Talents Program of CASthe State Key Laboratory of Fine Chemicals,Dalian University of Technology(KF1415)~~
文摘As an emerging class of crystalline porous materials, covalent organic frameworks（COFs） have been widely used as catalysts or catalyst supports. Flexible regulation of the pores and easy introduction of functional active sites onto the skeleton of COFs make them promising platforms for many catalysis applications. However, only a single function is generally observed in these COFs. Herein, we synthesized a negatively charged ionic COF（I-COF） and successfully incorporated functionalized counter ions, that is, metallic Mn2＋ and a coordination complex of manganese（Ⅱ） bipyridine complexes（[Mn（bpy）2]2＋）, via a simple ion exchange process. The resulting I-COFs can act as effective heterogeneous catalysts for epoxidation reactions. We envisage that with this type of ionic architecture, a variety of other functional cations could be exchanged into the frameworks, thus making the COF a versatile platform for different applications.
文摘Linear porphyrin-thiophene copolymers were synthesized by linking 5, 15-positions of porphyrin with tetrathiophene or bithiophene moieties for preparing conducting polymer. 2,8,12,18-tetraethyl-3,7,13,17-tetramethyl-5, 15-dithienylporphyrin4a (45.1%), 5, 15-di-bithienyl- 2,8,12,18-tetraethyl-3, 7, 13, 17-tetramethylporphyrin4b (61. 2%) and their metal complexes were also reported in high yields (>90%) as the monomers. 5, 15-di-bithienylporphyrin and its metal complexes could be polymerized by oxidation using FeCl3 as oxidant. However, 5,15-dithienylporphyrin and its metal complexes can not be polymerized by same reaction. Their polymers were synthesized by electrochemical oxidation on the gold-plate electrode. The structures of copolymers were identified by elemental analysis and IR spectra. And the conductivity of poly 5,15-di-bithienylporphyrin was measured to reach over 1.0× 10?6S/cm. Key words organic conductor - thienylporphyrin - porphyrin-thiophene copolymer - electropolymerization CLC number O 62 Foundation item: Supported by the National Natural Science Foundation of China (29872033, 20272046)Biography: CHEN Zhang-ping (1946-), male, Professor, research direction: porphyrin chemistry.
基金the Foundation of the Science and Technology Committee of Hubei Province(2001ABA009)
文摘The thermal decomposition processes of ephedrini hydrochloridum and its kinetics are studied by TG-DTG techniques. A combined method, which includes Achar method, Coats-Redfera method, and Ozawa method, is put forward for determining kinetic model under non-isothermal conditions. By applying the combined method, it is determined that the thermal decomposition of ephedrini hydrochloridum is subjected to cylindrical symmetric diffusion. And the reaction function isƒ(α)=2(1-α)?, apparent activation energy (115.26±3.55) kJ·mol−1, pre-exponential factor 4.62×108 s−1. Results show that the combined method is feasible and simple.
文摘We synthesized and characterized photoactivatable phospholipidic probes 1-3. These probes have the perfluorinated aryl azide function at the polar head of phospholipid. They are stable in dark and become highly reactive upon photoirradiation. The preliminary results suggest that they are promising tools to study the topology of membrane proteins and protein-lipid interactions using photolabeling approach.
基金Supported by the Key Technologies Research and Development Programme of the Ninth Five year Plan of China (96 554 03 01)
文摘A new kind of porous nano-'IiO_2 composite films was prepared on the glasssubstrate with the water glass as binders and the sodium fluorosilicate as solidifying reagent. Themorphologies of the films were studied by scanning electron microscope(SEM).The UV-Visspcctiophotometer was also used to investigate the absorption of the films. The gas-phasephotocatalytic oxidation of nitrogen oxides on the composite film was carried out in Ti0_2/UVsystem, and some important factors affecting the photocatalytic oxidation were also studied such asthe catalyst concentration, vapor pressure and the presence of oxygen. The results showed theconversion of NO_x reached 97.5% alter 2 h UV-irradiation. The final product of photo-oxidation wasdetected to be HNO_3 by FT-IR. The way of photocatalytic oxidation of NO_x was possibly useful inthe practical application.
文摘The photodegradation of 17α-ethynylestradiol (EE2) induced by highpressure mercury lamp (λ≥313 nm, 250 W) in aqueous solution with algae (e. g.Nitzschia hantzschiana andChlorella vulgaris) and Fe3+ was ineestigated initially. The affecting factors on the photodegradation were studied and described in details, such as algae concentration, Fe3+, exposure time, and so on. The concentration of EE2 in distilled water was determined using fluorescence spectrophotometer. The photodegradation of EE2 in aqueous solution exposed to 250 W high-pressure mercury lamp was evident in the presence of algae and Fe3+. With the algae concentration increasing, photodegradation rate increased. Fe3+ could accelerate the photocatalytic degradation of EE2 in aqueous solution with algae. The colloidal ferric hydroxide particles that might have absorbed on the algae cells could enhance the photocatalytic degradation of EE2 by algae. The catalysis in photocatalytic degradation reaction mainly resulted from the active oxygen (H2O2,1O2 and ·OH) that was caused by algae and Fe3+ under 250 W HPML. In this paper, the mechanism of photocatalytic degradation of EE2 by algae and Fe3+ is discussed theoretically in details. Key words 17α-ethynylestradiol - photodegradation - high-pressure mercury lamp - Nitzschia hantzschiana - Chlorella vulgaris - Fe3+ CLC number X 131. 2 Foundation item: Supported by the Scientific Research Foundation of Wuhan Environmental Protection Bureau and the National Natural Science Foundation of China (20177017)Biography: Liu Xian-li (1965-), male, Ph. D candidate, Associate professor, research direction: environmental chemistry
文摘A novel supramolecular adduct 3(C 42H 42N 28O 14) 2·H 2O (1) was synthesized by mixing 2- and cucurbit uril in solution of hydrochloric acid. The crystal structure was determined by single crystal X-ray diffraction analysis. The crystal belongs to orthorhombic system and space group F dd2 with cell dimensions: a=4.705 33 (5) nm, b=7.153 80 (6) nm, c= 1.894 61 (2) nm, Z=16, V=63.7744 (11) nm3, D c= 1.534 g/cm3, μ=3.007 mm -1, F(000)=29 120, R 1= 0.070 7, wR 2=0.169 2. In crystal, the cucurb uril molecules form two zig-zag chains.
文摘Molecular imprinting of theophylline in poly (methacrylic acid- ethylene dimethacrylate) as CEC stationary phases was synthesized by an in situ photo-initiated polymerization reaction. The effect of electrolyte pH on xanthine derivatives and the stability of MIP column performance were investigated. the relative standard deviation (D RS) of migration time of five consecutive runs on MIP column was in the range of 2.2%–3.1%. The reproducibility of migration time column to column of M(A) was in the range of 3.8%–4.9%. The highest column efficiency was more than 140 000 plates per meter. The MIP capillaries had showed better selective for theophylline, which comparing with the reference column. The urine sample was separated by spiked 5×10?4 mol·L?1 theophylline. Key words capillary electrochromatography - molecular imprinting polymers - theophylline CLC number O 657.8 Foundation item: Supported by the National Nature Science Foundation of China (20375028) and the Research Fund for the National High Technology Development “863” of China (2002AA2Z2004)Biography: Cai Ling-shuang (1968-), female, Associate professor, Ph. D, research direction: separation science.
文摘Twenty Yongzheng copper coins were fast dating by X-ray energy dispersive spectrometer with scanning electron microscope (SEM-EDS) according to official ingredient. The 20 coins were classified in two groups according to the results. Group 1 represents the coins minted before AD 1 728 and group 2 represents the coins minted after AD 1 728. At concentration range (0.00%–5.13%), the distribution of lead is not homogeneous in the coins, and the largest diameter of lead inclusion is less than 15 μm. The official fineness degrade is supported. Key words archaeometry - Yongzheng coins - dating - SEM-EDS CLC number O 69 - K 854.2 Foundation item: Supported by the Project of Instrument Upgraded of Ministry of Science and Technology of ChinaBiography: Lei Jun-feng (1975-), male, Ph. D, research direction: numismatic archaeology and instrument analysis.
文摘A simple and highly sensitive method for the determination of triamcinolone acetonide in pharmaceutical formulations is presented. The approach is based on the fluorescence of production of triamcinolone acetonide oxidized by concentrated sulfuric acid. The effect of H2SO4, β-cyclodextrin (β-CD), solvent and cetyltrimethylammonium bromide (CTMAB) were discussed. And two analytical systems were established. One is CTMAB system, the linear range is 0–4.6×10?6 mol/L, and the detection limit is 3.59×10?8 mol/L. The other is β-CD and ethanol system, the linear range is 0–2.3×10?6 mol/L and the detection limit is 1.91×10?8 mol/L. The selectivity of analysis, the analytical figures of optimization, and the accuracy of the method are demonstrated with the determination of triamcinolone acetonide in pharmaceutical preparations. Key words triamcinolone acetonide - fluorimetry - CTMAB - β-cyclodextrin - pharmaceutical analysis CLC number O 657.39 Foundation item: Supported by the National Natural Science Foundation of China (20275028)Biography: Pan Zu-ting (1945-), male, Professor, research direction: analytical chemistry.
文摘Poly (N, N, N-trimethyl-(2-pyrrol-1-yl) ethyl ammonium iodide)/V2O5 (PTPAI/V2O5) nanocomposites were synthesized by sol-gel method. This method involved formation of vanadium pentoxide xerogel in the presence of polypyrrole derivatives solution. X-ray diffraction (XRD) indicated that the polypyrrole derivative particles encapsulated in the fibrous V2O5 network and the layered distance significantly increased from 1. 077 39 to 1. 354 56 nm. The interaction between polypyrrole and V2O5 in the ‘nanocomposites’ was characterized by IR spectroscopy. The Scanning Electron Microscope (SEM) micrographs reveal the structural contrasts between the hybrid materials and the pristine vanadium oxide xerogel. Key words polypyrrole/V2O5 - nanocomposites - XRD - SEM CLC number O 633. 5 Foundation item: Supported by the Natural Science Foundation of Hubei Province (2003ABA030)Biography: Shi Chuang (1978-), male, Master candidate, research direction: synthesis chemistry.
文摘Ribavirin has been used in urgency to treat SARS patients recently. In order to study its antiviral mechanism by photolabeling approach, we have synthesized and characterized 5-azido-1-β-D-ribofuranosyl-1,2,4-triazole-3-carboxiamide 1 as a photolabeling probe of ribavirin. The azidotriazole nucleoside showed rapid and clean photochemical reaction, suggesting that l is a promising probe to study the antiviral mechanism of ribarivin by photolabeling.
文摘Lanthanum complex crystal with β alanine (1∶3) was synthesized. Through the DTA,TG,chemistry analysis and comparison with literature, it shows that its form is {[La 2(β ala) 6· (H 2O) 4](ClO 4) 6·H 2O} n , and its purity is 98.86%. The dissolution enthalpy of the reactants and products in 2 mol·L -1 HCl solution (298.15K) was measured by using the isoperibol reaction calorimetry. Δ rH m was calculated by a designed thermochemical cycle of the coordination reaction. From the results and other auxiliary quantities, the standard molar enthalpy of formation of [La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O is obtained to be Δ fH m°{[La 2(β ala) 6·(H 2O) 4](ClO 4) 6·H 2O} = - 7062.911 kJ·mol -1 .
文摘Ni(II)-dien complex was prepared and characterized by X-ray diffraction. The crystal belongs to triclinic system, space group P-1, with crystallographic parametersa=0.888 13(18) nm,b=0.890 10(18) nm,c=1. 591 8(3) nm, α=77.71(3)°, β=89.12(3)°, γ=61.24(3)°,Z=2. The two dien molecules coordinate to the central Ni atom, the six nitrogen atoms form a distorted octahedron. Preliminary pharmacological tests showed this complex had antitumor activity against HepG2 and HL-60 cell linesin vitro. Key words polyamines - Ni(II) complex - crystal structure - antitumor activity CLC number O 626 Foundation item, Supported by the National Natural Science Foundation of China (29972034)Biography: Li Tao (1976-), male, Ph. D candidate, research direction: ophthalmology and chemicalbiology.
基金This project is financially supported by the National Natural Science Foundation of China (No. 29971024) the Natural Science Foundation of Hubei Education Committee (No. 2002A00008)
文摘The Eu^(3+)-doped Na^(24)As_2W_(22)O_83 phosphor has been prepared by solidstare reaction from Na_3AsO_4.12H_2O, Na_2WO_4.2H_2O and WO_3, and characterized by elementalanalysis, infrared spectroscopy and powder X-ray diffractometry. According to the measurements withX-ray diffraction, this material belongs to orthorhombic system with its lattice constants: avelence 1.4750 nm, b velence 1.1944 nm, c velence 1.1062 nm, it is consistent with space groupD_2~4-P2_12_12_1 (No.19). The emission and excitation spectra were measured. The luminescentproperties of Eu^(3+)-doped Na^(24)As_2W_(22)O_83 and mechanism of energy transfer were discussed.
文摘A new bridging reagent, N,N ′\|bis(chloroacetyl)propylenediamine was used to explore the relative activity and bridging pattern of p \|tert\|buty lcalix\arene, p \|tert\|buty lcalix\arene and butylcalix\arene. It was found that the bridging reaction is selectively, at least, preferably at 1,3\|position for p \|tert\|butylcalix\arene and p \|tert\|b utylcalix\arene, 1,5\|position for p \|tert \|butylcalix\arene. Taking the yield of bridged calixarene as a comparsion standard, the activity decreases with the increasing of the number of phenolic units in calixarene.
文摘Three different spin-lattice relaxation times ( T_1) of water were obtainedin activated alumina-water slurry system, which indicate that there exist three states of water;bound water, pore water and bulk water. The chemical shift (delta_H) decreasesas the amount of wateradded to the system increases due to the differences in contribution of these three states of waterin the samples. The delta_H value for adsorbed water decreases nearly linearly and T_1 increaseswith elevating temperature, whichresult from the decrease in the content of bound water by theincrease in thermal motion.
基金The National Natural Science Foundation of China(59331030)
文摘The geometries of the molecules of eight organic additives were optimized and the net charge,E HOMO andE LUMO were obtained using AM method, respectively. The result shows that there is the correlation between the leveling property and the frontier orbital energy levels of these additives, and the adsorption models and leveling mechanics were discussed. The rule between the frontier orbital energy levels and the leveling property is verified by the experiments.
