The neodymium trifluoroacetate complexes were synthesized and characterized by single-crystal X-ray diffraction for [Nd（CF3COO）3·Bpy·（H2O）3]Bpy（1）,elemental and TG analysis,FT-IR spectra,and PL spectra...The neodymium trifluoroacetate complexes were synthesized and characterized by single-crystal X-ray diffraction for [Nd（CF3COO）3·Bpy·（H2O）3]Bpy（1）,elemental and TG analysis,FT-IR spectra,and PL spectra for Nd（CF3COO）3·Bpy（2）（Bpy：2,2＇-bipyri-dine）.The most interesting feature of the crystal structure for 1 is that it comprises a coordinated 2,2＇-bipyridine molecule and an out-sphere 2,2＇-bipyridine molecule.At the same time,the C-O distances appeared average which indicates the three atoms of carboxylato forming elec-tron-conjugate system.Hydrogen bond and π-π-stacking link the binuclear to two-dimensional sheet.The optical spectra for 2 exhibited that the complex possessed typical Nd（III） ion absorption and photoluminescence emission.The emission cross-section of 4F3/2→4I11/2 fluores-cence transition（3.63×10-20 cm2） was comparable with some laser glasses,which indicated good radiative properties of this neodymium trifluoroacetate complex in liquid matrix.The thermal analysis indicated that it was quite stable to heat.展开更多
建立了离子色谱-间接紫外检测法同时分析离子液体中的三氟乙酸根（CF3COO-）、四氟硼酸根（BF4-）和三氟甲烷磺酸根（CF3SO3-）的方法。用Shodex IC NI-424阴离子交换柱作为分离柱,探讨了影响上述三种离子保留和检测的因素及其保留规律...建立了离子色谱-间接紫外检测法同时分析离子液体中的三氟乙酸根（CF3COO-）、四氟硼酸根（BF4-）和三氟甲烷磺酸根（CF3SO3-）的方法。用Shodex IC NI-424阴离子交换柱作为分离柱,探讨了影响上述三种离子保留和检测的因素及其保留规律。最终选用色谱条件为：以1.75 mmol·L^-1邻苯二甲酸-1.68 mmol·L^-1三（羟甲基）氨基甲烷为淋洗液,柱温45℃,流速1.0 m L·min^-1,UV检测波长设定在265 nm。在此条件下,可实现上述三种阴离子的同时分析,且色谱峰形良好。所测阴离子的检出限（S/N=3）为0.39-1.57 mg·L^-1,保留时间和峰面积的相对标准偏差（n=5）均在1%以下。将此方法应用于测定离子液体中的三氟乙酸根、四氟硼酸根及三氟甲烷磺酸根,加标回收率为99%-102%。该方法简单、准确、可靠,具有较好的实用性。展开更多
In the presence of copper （I） halide as catalyst, a variety of carbonyl compounds could be trifluoromethylated with sodium trifluoroacetate to give the corresponding alcohols in moderate to high yields.
Single-layer YBa2Cu3O7-δ（YBCO） films with the thickness of over 600 nm were fabricated by modified metal organic deposition using trifluoroacetate metal organic deposition（TFA-MOD） method on LaAlO3（LAO） substra...Single-layer YBa2Cu3O7-δ（YBCO） films with the thickness of over 600 nm were fabricated by modified metal organic deposition using trifluoroacetate metal organic deposition（TFA-MOD） method on LaAlO3（LAO） substrates. Polyvinylbutyral（PVB） was added into the precursor solution to enhance the thickness of the single layer. The pyrolysis process was shortened to about 3 h due to the reduction of the fluorine content in the precursor solution.The effects of heating rate during the crystallization process on the microstructure and Jcvalues of YBCO films were investigated. The α-axis-oriented YBCO crystals dominate when the heating rate is lower than 20 °C·min^-1, while faster heating rate of 43 °C·min^-1 results in pure c-axis epitaxial growth. The Jcvalues of YBCO films increase linearly with heating rate increasing due to the increase of c-axis YBCO growth, and the critical current（Ic） value of 100 A·cm^-1 within a single-layer YBCO film is achieved.展开更多
The complexes of rare earth trifluoroacetate with two 1, 10-phenanthroline Ln (CF_3COO)_3 ·(Phen )_2· CH_3COCH_3·3H_2O (Ln=La, Pr, Nd, Sm, Eu) have prepared in the mixed slovents of H_2O and CH_3COCH_3,...The complexes of rare earth trifluoroacetate with two 1, 10-phenanthroline Ln (CF_3COO)_3 ·(Phen )_2· CH_3COCH_3·3H_2O (Ln=La, Pr, Nd, Sm, Eu) have prepared in the mixed slovents of H_2O and CH_3COCH_3, and the single crystal Nd (CF_3COO)_3· (Phen )_2· CH_3COCH_3· 3H_2O was determined by four-circle X-ray diffractometer. The crystal is a monoclinic system with space group P2_1/n(14# ), a=0. 9253 ( 1 )nm , b=2. 1500 ( 2 ) nm , c=1.8981 ( 4 ) nm, β= 95. 28( 1 )°, V=3.760(8) nm￣3 , Z=4 , R=0. 035. The coordination number of Nd is 9 , and the coordination polyhedron of Nd atom is distorted tricapped triagonal prism. The electronic structures and chemical bonds of the complex Nd (CF_3COO)_3· (Phen )_2· CH_3COCH_3·3H_2O is studied by the spin unrestricted INDO method.展开更多
The mononuclear manganese complex Mn(phen)(CF3COO)(H2O)3NO3 (C14H14- O8N3F3Mn) has been synthesized, where phen = 1,10-phenanthroline. The molecular and crystal structures were determined by single-crystal X-ray diffr...The mononuclear manganese complex Mn(phen)(CF3COO)(H2O)3NO3 (C14H14- O8N3F3Mn) has been synthesized, where phen = 1,10-phenanthroline. The molecular and crystal structures were determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/c with a = 8.8550(3), b = 10.6529(3), c = 19.8763(2) ? ?= 97.762(2), V = 1857.78(8) 3, Z = 4, Mr = 464.22, Dc = 1.660 g/cm3, ?= 0.789 mm-1, F(000) = 940, T = 293(2) K, R = 0.0764 and wR = 0.2441 for 1995 observed reflections with I > 2s(I). In the crystal the manganese atom is six-coordinated by two chelated nitrogen atoms from phenanthroline, three oxygen atoms from water molecules and one oxygen atom from trifluoroacetate, completing an octahedral geometry.展开更多
Two novel ionic liquids, N,N＇-disalicylideneethylenediaminium acetate and N,N＇-disalicylideneethylenediaminium trifluoroacetate, were prepared and characterized by IR, ^1H NMR, DTA-TG and elemental analysis. The exp...Two novel ionic liquids, N,N＇-disalicylideneethylenediaminium acetate and N,N＇-disalicylideneethylenediaminium trifluoroacetate, were prepared and characterized by IR, ^1H NMR, DTA-TG and elemental analysis. The experimental results indicate that the new ionic liquids possess lower melting point and higher electrical conductivity. It is noteworthy that the ionic liquids reported herein are the first member of the ionic liquid family with the Schiff base functional group in the cation.展开更多
基金supported by the National Natural Science Foundation of China(60977023,10876009)CAS Special Grant for Postgraduate Research,Innovation and Practice
文摘The neodymium trifluoroacetate complexes were synthesized and characterized by single-crystal X-ray diffraction for [Nd（CF3COO）3·Bpy·（H2O）3]Bpy（1）,elemental and TG analysis,FT-IR spectra,and PL spectra for Nd（CF3COO）3·Bpy（2）（Bpy：2,2＇-bipyri-dine）.The most interesting feature of the crystal structure for 1 is that it comprises a coordinated 2,2＇-bipyridine molecule and an out-sphere 2,2＇-bipyridine molecule.At the same time,the C-O distances appeared average which indicates the three atoms of carboxylato forming elec-tron-conjugate system.Hydrogen bond and π-π-stacking link the binuclear to two-dimensional sheet.The optical spectra for 2 exhibited that the complex possessed typical Nd（III） ion absorption and photoluminescence emission.The emission cross-section of 4F3/2→4I11/2 fluores-cence transition（3.63×10-20 cm2） was comparable with some laser glasses,which indicated good radiative properties of this neodymium trifluoroacetate complex in liquid matrix.The thermal analysis indicated that it was quite stable to heat.
文摘建立了离子色谱-间接紫外检测法同时分析离子液体中的三氟乙酸根（CF3COO-）、四氟硼酸根（BF4-）和三氟甲烷磺酸根（CF3SO3-）的方法。用Shodex IC NI-424阴离子交换柱作为分离柱,探讨了影响上述三种离子保留和检测的因素及其保留规律。最终选用色谱条件为：以1.75 mmol·L^-1邻苯二甲酸-1.68 mmol·L^-1三（羟甲基）氨基甲烷为淋洗液,柱温45℃,流速1.0 m L·min^-1,UV检测波长设定在265 nm。在此条件下,可实现上述三种阴离子的同时分析,且色谱峰形良好。所测阴离子的检出限（S/N=3）为0.39-1.57 mg·L^-1,保留时间和峰面积的相对标准偏差（n=5）均在1%以下。将此方法应用于测定离子液体中的三氟乙酸根、四氟硼酸根及三氟甲烷磺酸根,加标回收率为99%-102%。该方法简单、准确、可靠,具有较好的实用性。
文摘In the presence of copper （I） halide as catalyst, a variety of carbonyl compounds could be trifluoromethylated with sodium trifluoroacetate to give the corresponding alcohols in moderate to high yields.
基金financially supported by the National Natural Science Foundation of China (No.51002024)the Sichuan Youth Science and Technology Innovation Research Team (No.2011JTD0006)+1 种基金the Program for Cooperation of Industry, Education and Academy of Guangdong Province, China (No. 2012B091100298)the Fundamental Research Funds for the Central Universities (Nos.ZYGX2012J039, ZYGX2011Z002, and ZYGX2012J035)
文摘Single-layer YBa2Cu3O7-δ（YBCO） films with the thickness of over 600 nm were fabricated by modified metal organic deposition using trifluoroacetate metal organic deposition（TFA-MOD） method on LaAlO3（LAO） substrates. Polyvinylbutyral（PVB） was added into the precursor solution to enhance the thickness of the single layer. The pyrolysis process was shortened to about 3 h due to the reduction of the fluorine content in the precursor solution.The effects of heating rate during the crystallization process on the microstructure and Jcvalues of YBCO films were investigated. The α-axis-oriented YBCO crystals dominate when the heating rate is lower than 20 °C·min^-1, while faster heating rate of 43 °C·min^-1 results in pure c-axis epitaxial growth. The Jcvalues of YBCO films increase linearly with heating rate increasing due to the increase of c-axis YBCO growth, and the critical current（Ic） value of 100 A·cm^-1 within a single-layer YBCO film is achieved.
文摘The complexes of rare earth trifluoroacetate with two 1, 10-phenanthroline Ln (CF_3COO)_3 ·(Phen )_2· CH_3COCH_3·3H_2O (Ln=La, Pr, Nd, Sm, Eu) have prepared in the mixed slovents of H_2O and CH_3COCH_3, and the single crystal Nd (CF_3COO)_3· (Phen )_2· CH_3COCH_3· 3H_2O was determined by four-circle X-ray diffractometer. The crystal is a monoclinic system with space group P2_1/n(14# ), a=0. 9253 ( 1 )nm , b=2. 1500 ( 2 ) nm , c=1.8981 ( 4 ) nm, β= 95. 28( 1 )°, V=3.760(8) nm￣3 , Z=4 , R=0. 035. The coordination number of Nd is 9 , and the coordination polyhedron of Nd atom is distorted tricapped triagonal prism. The electronic structures and chemical bonds of the complex Nd (CF_3COO)_3· (Phen )_2· CH_3COCH_3·3H_2O is studied by the spin unrestricted INDO method.
基金This work was supported by the State Key Basic Research and Development Plan (G1998010100) and NNSFC (No. 30170229 and 29973047)
文摘The mononuclear manganese complex Mn(phen)(CF3COO)(H2O)3NO3 (C14H14- O8N3F3Mn) has been synthesized, where phen = 1,10-phenanthroline. The molecular and crystal structures were determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/c with a = 8.8550(3), b = 10.6529(3), c = 19.8763(2) ? ?= 97.762(2), V = 1857.78(8) 3, Z = 4, Mr = 464.22, Dc = 1.660 g/cm3, ?= 0.789 mm-1, F(000) = 940, T = 293(2) K, R = 0.0764 and wR = 0.2441 for 1995 observed reflections with I > 2s(I). In the crystal the manganese atom is six-coordinated by two chelated nitrogen atoms from phenanthroline, three oxygen atoms from water molecules and one oxygen atom from trifluoroacetate, completing an octahedral geometry.
基金Project supported by the National Natural Science Foundation of China （Nos. 20273021 and 20173017）.
文摘Two novel ionic liquids, N,N＇-disalicylideneethylenediaminium acetate and N,N＇-disalicylideneethylenediaminium trifluoroacetate, were prepared and characterized by IR, ^1H NMR, DTA-TG and elemental analysis. The experimental results indicate that the new ionic liquids possess lower melting point and higher electrical conductivity. It is noteworthy that the ionic liquids reported herein are the first member of the ionic liquid family with the Schiff base functional group in the cation.
