The Ag2S2 rings connect [Fe(NCS)5(DMF)]2- (DMF=N,N-dimethylformamide) octahedrons by bridging thiocyanates leading to a 3-D [Ag2Fe(SCN)5(DMF)]n framework. The Fe(III) atoms are in the octahedral geometry and Ag(I) ato...The Ag2S2 rings connect [Fe(NCS)5(DMF)]2- (DMF=N,N-dimethylformamide) octahedrons by bridging thiocyanates leading to a 3-D [Ag2Fe(SCN)5(DMF)]n framework. The Fe(III) atoms are in the octahedral geometry and Ag(I) atoms are in the distorted tetrahedral geometry. One-dimensional Ag2S2-S-Ag2S2 wave-like strand chains along the b-axis and channels constructed from ten-membered Ag2Fe(SCN)2S rings along the c-axis feature the three-dimensional framework. The Ag…Ag distance of 0.3103(1) nm in Ag2S2 rings indicates weak Ag…Ag inter-action. Such an Ag2S2-S-Ag2S2 chain in silver(I) complexes is unprecedented. Crystal data: Mr=635.09, ortho-rhombic, Pnma, a=1.64214(13) nm,b=1.40075(11) nm,c=0.84445(7) nm,V=1.9424(3) nm3,Z=4, m(Mo Ka)=3.278 mm-1, Dcalcd=2.172 g·cm-3, F(000)=1220, R1=0.0443, wR2=0.1138.展开更多
The reaction of 2-nitro-（2-pyridylsulfanylmethyl）benzene L with silver nitrate produces a centrosymmetric binuclear complex bis（2-nitro-（2-pyridylsulfanylmethyl）benzene-N,S）- bis（nitrato-O,O）-disilver（Ⅰ）, [...The reaction of 2-nitro-（2-pyridylsulfanylmethyl）benzene L with silver nitrate produces a centrosymmetric binuclear complex bis（2-nitro-（2-pyridylsulfanylmethyl）benzene-N,S）- bis（nitrato-O,O）-disilver（Ⅰ）, [AgLNO3]2 1. The crystal is of triclinic, space group PI, with a = 7.383 （3）, b = 8.340（3）, c = 12..003（4） A, a = 95.069（6）, β = 93.498（5）, γ = 102.734（6）°, C24H20Ag2N6- O10S2, Mr= 832.32, V = 715.6（4） ,A^3, Z = 1, Dc = 1.931 g/cm^3, F（000） = 412,μ = 1.581 mm^-1, R= 0.0351 and wR = 0.0749 Each silver atom is tetrahedrally coordinated by two O atoms from bidentate nitrate, one S atom from a ligand and one N atom from another ligand. Furthermore, Ag- Ag interactions have been observed in the complex.展开更多
An efficient visible-light-driven plasmonic photocatalyst with regard to graphene oxide(GO) hybridized Ag/Ag3PO4(Ag/Ag3PO4/GO) nanostructures has been facilely synthesized via a deposition-precipitation method.The syn...An efficient visible-light-driven plasmonic photocatalyst with regard to graphene oxide(GO) hybridized Ag/Ag3PO4(Ag/Ag3PO4/GO) nanostructures has been facilely synthesized via a deposition-precipitation method.The synthesized nanostructures have been characterized by means of scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDX),X-ray diffraction(XRD),UV-vis spectra,Fourier transform infrared spectra(FT-IR),X-ray photoelectron spectroscopy(XPS),and Raman spectra.It has been disclosed that compared with the bare Ag/Ag3PO4 nanospecies,the GO hybridized nanostructures display enhanced photocatalytic activity for the photodegradation of methyl orange pollutant under visible-light irradiation.It is suggested that the reinforced charge transfer and the suppressed recombination of electron-hole pairs in Ag/Ag3PO4 /GO,the smaller size of Ag/Ag3PO4 nanospecies in Ag/Ag3PO4/GO,all of which are the consequences of the hybridization of GO,are responsible for the enhanced photocatalytic performance.The investigation might open up new opportunities to obtain highly efficient Ag3PO4-based visible-light-driven plasmonic photocatalyst for the photodegradation of organic pollutants.展开更多
文摘采用高纯银箔(99.99%)的电化学氧化法制备了全固态卷压式Ag/Ag Cl电极,并用于混凝土中的Cl-浓度检测。该Cl-选择电极具有较大的比表面积和交换电流密度,以及较低的温度系数。在模拟混凝土孔隙液中的测试表明:相比粉压式Ag/Ag Cl电极,卷压式电极具有更接近理论值的线性电压响应斜率(-58.2 m V)和电位稳定性,在230 d内电位波动不大于4 m V。混凝土中Cl-浓度测量表明:通过将电极表面包裹了一层PVA凝胶电解质薄膜,可显著提高其Cl-电位响应稳定性和抗干扰能力,且电极电位与混凝土中的lg[Cl-]之间具有良好线性度。表面分析证明,该卷压式电极不仅增加了电极的活性表面积,提高了电极的稳定性与反应活性;同时,借助于Ag Cl/Ag的多层堆叠,增强了Ag Cl颗粒与Ag基体间的附着力,提高了混凝土中Cl-的检测可靠性和电极的使用寿命。
文摘The Ag2S2 rings connect [Fe(NCS)5(DMF)]2- (DMF=N,N-dimethylformamide) octahedrons by bridging thiocyanates leading to a 3-D [Ag2Fe(SCN)5(DMF)]n framework. The Fe(III) atoms are in the octahedral geometry and Ag(I) atoms are in the distorted tetrahedral geometry. One-dimensional Ag2S2-S-Ag2S2 wave-like strand chains along the b-axis and channels constructed from ten-membered Ag2Fe(SCN)2S rings along the c-axis feature the three-dimensional framework. The Ag…Ag distance of 0.3103(1) nm in Ag2S2 rings indicates weak Ag…Ag inter-action. Such an Ag2S2-S-Ag2S2 chain in silver(I) complexes is unprecedented. Crystal data: Mr=635.09, ortho-rhombic, Pnma, a=1.64214(13) nm,b=1.40075(11) nm,c=0.84445(7) nm,V=1.9424(3) nm3,Z=4, m(Mo Ka)=3.278 mm-1, Dcalcd=2.172 g·cm-3, F(000)=1220, R1=0.0443, wR2=0.1138.
基金The Science Foundation of University of Science and Technology of Suzhou
文摘The reaction of 2-nitro-（2-pyridylsulfanylmethyl）benzene L with silver nitrate produces a centrosymmetric binuclear complex bis（2-nitro-（2-pyridylsulfanylmethyl）benzene-N,S）- bis（nitrato-O,O）-disilver（Ⅰ）, [AgLNO3]2 1. The crystal is of triclinic, space group PI, with a = 7.383 （3）, b = 8.340（3）, c = 12..003（4） A, a = 95.069（6）, β = 93.498（5）, γ = 102.734（6）°, C24H20Ag2N6- O10S2, Mr= 832.32, V = 715.6（4） ,A^3, Z = 1, Dc = 1.931 g/cm^3, F（000） = 412,μ = 1.581 mm^-1, R= 0.0351 and wR = 0.0749 Each silver atom is tetrahedrally coordinated by two O atoms from bidentate nitrate, one S atom from a ligand and one N atom from another ligand. Furthermore, Ag- Ag interactions have been observed in the complex.
基金supported by the National Natural Science Foundation of China (20873159,21021003 and 91027042)the Ministry of Science and Technology of China (2011CB932301)
文摘An efficient visible-light-driven plasmonic photocatalyst with regard to graphene oxide(GO) hybridized Ag/Ag3PO4(Ag/Ag3PO4/GO) nanostructures has been facilely synthesized via a deposition-precipitation method.The synthesized nanostructures have been characterized by means of scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDX),X-ray diffraction(XRD),UV-vis spectra,Fourier transform infrared spectra(FT-IR),X-ray photoelectron spectroscopy(XPS),and Raman spectra.It has been disclosed that compared with the bare Ag/Ag3PO4 nanospecies,the GO hybridized nanostructures display enhanced photocatalytic activity for the photodegradation of methyl orange pollutant under visible-light irradiation.It is suggested that the reinforced charge transfer and the suppressed recombination of electron-hole pairs in Ag/Ag3PO4 /GO,the smaller size of Ag/Ag3PO4 nanospecies in Ag/Ag3PO4/GO,all of which are the consequences of the hybridization of GO,are responsible for the enhanced photocatalytic performance.The investigation might open up new opportunities to obtain highly efficient Ag3PO4-based visible-light-driven plasmonic photocatalyst for the photodegradation of organic pollutants.
文摘以钛酸丁酯为前驱体,溴化十六烷基三甲胺为制孔剂,采用一步水热法并结合光还原处理制备出银等离子基元负载多孔TiO2光催化剂.结果表明,所制得的Ag@Ag2S/porous TiO2催化剂为锐钛矿相,并有部分板钛矿相,其BET比表面积达243.9 m2/g,平均孔径为2.98 nm.由于银基表面等离子效应,催化剂光吸收边际红移到475nm处,其在可见光范围的响应明显增强,光生电子-空穴对更容易分离,因而催化剂活性明显增强.在氙灯(加滤光片使波长大于400 nm)照射下90 min Ag@Ag2S/porous TiO2可以使甲基橙脱色降解率达到98%.并且此催化剂在重复利用5次后,对甲基橙溶液的脱色降解率仍能保持在90%以上,具有稳定的光催化活性.采用抑菌环法,以大肠杆菌为实验菌种,对催化材料的抗菌性能进行了测试,结果表明,所制得的催化剂Ag@Ag2S/porous TiO2具有较好的抑菌效果,抑菌圈直径达到11 mm.
