The exploration of efficient electrocatalysts for the reduction of CO2 to C2H4 is of significant importance but is also a challenging subject.Cu-based bimetallic catalysts are extremely promising for efficient CO2 red...The exploration of efficient electrocatalysts for the reduction of CO2 to C2H4 is of significant importance but is also a challenging subject.Cu-based bimetallic catalysts are extremely promising for efficient CO2 reduction.In this work,we synthesize a series of porous bimetallic Cu–Sb alloys with different compositions for the catalytic reduction of CO2 to C2H4.It is demonstrated that the alloy catalysts are much more efficient than the pure Cu catalyst.The performance of the alloy catalysts depended strongly on the composition.Further,the alloy with a Cu:Sb ratio of 10:1 yielded the best results;it exhibited a high C2H4 Faradaic efficiency of 49.7%and a high current density of 28.5 mA cm?2 at?1.19 V vs.a reversible hydrogen electrode(RHE)in 0.1 M KCl solution.To the best of our knowledge,the electrocatalytic reduction of CO2 to C2H4 using Cu–Sb alloys as catalysts has not been reported.The excellent performance of the porous alloy catalyst is attributed to its favorable electronic configuration,large surface area,high CO2 adsorption rate,and fast charge transfer rate.展开更多
The title complex [Cu2(bipy)2OAcClOH]TsTausH3H2O(C31H37Cl- Cu2N5O11S2) has been synthesized by the reaction of 2,2?bipyridine(bipy), N-P-tolysulfony taurine (TsTausH) and copper acetate in water-ethanol solution, and ...The title complex [Cu2(bipy)2OAcClOH]TsTausH3H2O(C31H37Cl- Cu2N5O11S2) has been synthesized by the reaction of 2,2?bipyridine(bipy), N-P-tolysulfony taurine (TsTausH) and copper acetate in water-ethanol solution, and its crystal structure was determined by X-ray diffraction method. The crystal belongs to triclinic, space group P with a = 0.74485(14), b = 1.6094(3), c = 1.7472(3) nm, a = 114.662(4), b = 99.997(4), g = 93.218(4), V = 1.8551(6) nm3, Mr = 882.31, Z = 2, Dc = 1.580 g/cm3, m = 1.395 mm-1 and F(000) = 906. The complex is a binuclear copper compound, and the two copper ions nearly have the same coordination environment. There exists MM bond in the complex. The distance of Cu(1)Cu(2) is 0.29747(7) nm. The two ions form two distorted octahedral geometries.展开更多
The mononuclear copper(I) complex, [Cu(dppe)2](PF6)(CH3COCH3) [dppe = bis-(diphenylphosphino)ethane] has been synthesized and characterized by X-ray crystallography. The crystal belongs to monoclinic, Mr=1062.3, space...The mononuclear copper(I) complex, [Cu(dppe)2](PF6)(CH3COCH3) [dppe = bis-(diphenylphosphino)ethane] has been synthesized and characterized by X-ray crystallography. The crystal belongs to monoclinic, Mr=1062.3, space group P21/n with cell parameters a =14.741(2), b =19.354(8), c =18.587(3) ? = 91.41(1)°, V = 5301.5 3, Z = 4, Dc=1.302 g/cm3, F(000)= 2200, = 6.16cm-1, R=0.062, Rw = 0.068. A total of 9679 independent reflections were collected, of which 4574 reflections with I >3σ(I) were observed. The central Cu atom is coordinated by four P atoms from dppe to form a distorted tetrahedral environment. In the coordination sphere the bond lengths of CuP(1), CuP(2), CuP(3) and CuP(4) are 2.298(2), 2.305(2), 2.311(2) and 2.295? respectively; and the PCuP bond angles vary from 87.52(9) to 120.12(9)?展开更多
The title complex [Cu2(-dppm)2(-Et2dtc)](ClO4)EtOH0.25H2O (dppm = bis- (diphenylphosphino)methane, Et2dtc = diethyldithiocarbamate) has been synthesized and characterized by single-crystal X-ray diffraction analysis. ...The title complex [Cu2(-dppm)2(-Et2dtc)](ClO4)EtOH0.25H2O (dppm = bis- (diphenylphosphino)methane, Et2dtc = diethyldithiocarbamate) has been synthesized and characterized by single-crystal X-ray diffraction analysis. The crystal structure is of monoclinic, space group C2/c with a = 42.587(1), b = 14.1653(4), c = 20.5649(5) ? = 105.945(1)? V =11928.6 3, C57H60.5ClCu2NO5.25P4S2, Mr = 1194.09, Z = 8, Dc = 1.330 g/cm3, (MoK) = 0.98 mm-1 and F(000) = 4948. A total of 15243 reflections were collected, of which 7322 were unique. The structure was refined to R = 0.0739 and wR = 0.1846 for 5135 observed reflections with I > 2(I). The crystal structure consists of the complex cation [Cu2(-dppm)2(-Et2dtc)]+, anion ClO4- and solvate H2O and EtOH, where the dinuclear Cu(Ⅰ) atoms are bridged doubly by two dppm ligands and singly by Et2dtc to give three five-membered rings. The Cu(Ⅰ) atom is in an approxi- mately trigonal-planar environment with the P2S chromophore. The short Cu贩稢u separation (2.7111 ? suggests the presence of metal-metal contact.展开更多
A novel binuclear copper (Ⅱ) complex,namely [Cu 2｛Ph 3P(CH 2) 2CO 2｝ 4(NO 3) 2]·(NO 3) 2 1,has been synthesized from the reaction of Cu(NO 3) 2·4H 2O with Ph 3P +(CH 2) 2CO - 2 L.The si...A novel binuclear copper (Ⅱ) complex,namely [Cu 2｛Ph 3P(CH 2) 2CO 2｝ 4(NO 3) 2]·(NO 3) 2 1,has been synthesized from the reaction of Cu(NO 3) 2·4H 2O with Ph 3P +(CH 2) 2CO - 2 L.The single crystal X ray structural analysis of 1 indicates that the compound crystallizes in space group P1(No.2) with a=12.652(3),b=18.983(4),c=9.102(3),α=97.26(2)°,β=107.38(2)°,γ=102.22(2)° and Z=1.In complex 1,a pair of Cu(Ⅱ) atoms are bridged by carboxylate groups of four ligand molecules with a Cu…Cu distance of 2.738 to form a tetrakis (carboxylato O,O) bridge dimetal core,and the apical coordination positions are occupied by monodentate nitrato anions,which is rare in the structures of similar Cu(Ⅱ) complexes in which the apical ligands are usually neutral molecules.The result shows that introducing the anionic ligands into the coordination sphere of the Cu(Ⅱ) atom significantly increases the Cu…Cu distance.展开更多
The complex[Cu (dppe)2](NO3)2 was prepared by the reaction of copper(Ⅱ) nitrate with bis(diphenylphosphino) ethane(dppe) in methanol and its crystal structure was determined by X-ray diffraction.The structure was so...The complex[Cu (dppe)2](NO3)2 was prepared by the reaction of copper(Ⅱ) nitrate with bis(diphenylphosphino) ethane(dppe) in methanol and its crystal structure was determined by X-ray diffraction.The structure was solved by direct methods and refined by block-diagonal and full-matrix least-squares methods to a final R of 0.043 for 4085 independent reflections of I>3σ(I).The crystal is monoclinic, space group P21/n,Mr=984.41 with cell parameters a=12.896(2),b=22.250(4),c=17.512(5)A,β=101.6(3)°, V=4922.3 A3,Z=4,Dc=1.590 g/cm3,F(000)=1900,μ=10.573 cm-1. In this complex, C52H48CuN2O6P4, dppe functions as a bidentate chelate ligand. The four phosphorus atoms from two dppe are coordinated to the distorted tetrahedral copper.展开更多
A curcumin derivative ligand,1,7-bis(3-methoxyl-4-acetoxyl)phenyl-1,6-heptadiene-3,5-diketone (diacetylcurcumin,abbreviated as HL),and its Cu and Ni complexes have been synthesized and fully characterized by elemental...A curcumin derivative ligand,1,7-bis(3-methoxyl-4-acetoxyl)phenyl-1,6-heptadiene-3,5-diketone (diacetylcurcumin,abbreviated as HL),and its Cu and Ni complexes have been synthesized and fully characterized by elemental analyses,IR,1 HNMR and molar conductivity.The resulting complexes exhibit two-photon excited fluorescence (TPEF) in DMF,and have been proven to be potentially useful for two-photon microscopy imaging in living cells.In addition,cytotoxicity tests showed that the low-micromolar concentrations of ML 2 did not cause significant reduction in cell viability over a period of at least 24 h and should be safe for further biological studies.展开更多
文摘The exploration of efficient electrocatalysts for the reduction of CO2 to C2H4 is of significant importance but is also a challenging subject.Cu-based bimetallic catalysts are extremely promising for efficient CO2 reduction.In this work,we synthesize a series of porous bimetallic Cu–Sb alloys with different compositions for the catalytic reduction of CO2 to C2H4.It is demonstrated that the alloy catalysts are much more efficient than the pure Cu catalyst.The performance of the alloy catalysts depended strongly on the composition.Further,the alloy with a Cu:Sb ratio of 10:1 yielded the best results;it exhibited a high C2H4 Faradaic efficiency of 49.7%and a high current density of 28.5 mA cm?2 at?1.19 V vs.a reversible hydrogen electrode(RHE)in 0.1 M KCl solution.To the best of our knowledge,the electrocatalytic reduction of CO2 to C2H4 using Cu–Sb alloys as catalysts has not been reported.The excellent performance of the porous alloy catalyst is attributed to its favorable electronic configuration,large surface area,high CO2 adsorption rate,and fast charge transfer rate.
基金This work was supported by the NSF of Guangxi Province (0339034) and the Science Research Foundation of Guangxi Universities
文摘The title complex [Cu2(bipy)2OAcClOH]TsTausH3H2O(C31H37Cl- Cu2N5O11S2) has been synthesized by the reaction of 2,2?bipyridine(bipy), N-P-tolysulfony taurine (TsTausH) and copper acetate in water-ethanol solution, and its crystal structure was determined by X-ray diffraction method. The crystal belongs to triclinic, space group P with a = 0.74485(14), b = 1.6094(3), c = 1.7472(3) nm, a = 114.662(4), b = 99.997(4), g = 93.218(4), V = 1.8551(6) nm3, Mr = 882.31, Z = 2, Dc = 1.580 g/cm3, m = 1.395 mm-1 and F(000) = 906. The complex is a binuclear copper compound, and the two copper ions nearly have the same coordination environment. There exists MM bond in the complex. The distance of Cu(1)Cu(2) is 0.29747(7) nm. The two ions form two distorted octahedral geometries.
基金We thank NSFC(No.29871009) Henan Province Outstanding Youth Science Foundation Natural Science Foundation for the financial support of this research.
文摘The mononuclear copper(I) complex, [Cu(dppe)2](PF6)(CH3COCH3) [dppe = bis-(diphenylphosphino)ethane] has been synthesized and characterized by X-ray crystallography. The crystal belongs to monoclinic, Mr=1062.3, space group P21/n with cell parameters a =14.741(2), b =19.354(8), c =18.587(3) ? = 91.41(1)°, V = 5301.5 3, Z = 4, Dc=1.302 g/cm3, F(000)= 2200, = 6.16cm-1, R=0.062, Rw = 0.068. A total of 9679 independent reflections were collected, of which 4574 reflections with I >3σ(I) were observed. The central Cu atom is coordinated by four P atoms from dppe to form a distorted tetrahedral environment. In the coordination sphere the bond lengths of CuP(1), CuP(2), CuP(3) and CuP(4) are 2.298(2), 2.305(2), 2.311(2) and 2.295? respectively; and the PCuP bond angles vary from 87.52(9) to 120.12(9)?
基金Supported by the Government of Guangdong province
文摘The title complex [Cu2(-dppm)2(-Et2dtc)](ClO4)EtOH0.25H2O (dppm = bis- (diphenylphosphino)methane, Et2dtc = diethyldithiocarbamate) has been synthesized and characterized by single-crystal X-ray diffraction analysis. The crystal structure is of monoclinic, space group C2/c with a = 42.587(1), b = 14.1653(4), c = 20.5649(5) ? = 105.945(1)? V =11928.6 3, C57H60.5ClCu2NO5.25P4S2, Mr = 1194.09, Z = 8, Dc = 1.330 g/cm3, (MoK) = 0.98 mm-1 and F(000) = 4948. A total of 15243 reflections were collected, of which 7322 were unique. The structure was refined to R = 0.0739 and wR = 0.1846 for 5135 observed reflections with I > 2(I). The crystal structure consists of the complex cation [Cu2(-dppm)2(-Et2dtc)]+, anion ClO4- and solvate H2O and EtOH, where the dinuclear Cu(Ⅰ) atoms are bridged doubly by two dppm ligands and singly by Et2dtc to give three five-membered rings. The Cu(Ⅰ) atom is in an approxi- mately trigonal-planar environment with the P2S chromophore. The short Cu贩稢u separation (2.7111 ? suggests the presence of metal-metal contact.
文摘A novel binuclear copper (Ⅱ) complex,namely [Cu 2｛Ph 3P(CH 2) 2CO 2｝ 4(NO 3) 2]·(NO 3) 2 1,has been synthesized from the reaction of Cu(NO 3) 2·4H 2O with Ph 3P +(CH 2) 2CO - 2 L.The single crystal X ray structural analysis of 1 indicates that the compound crystallizes in space group P1(No.2) with a=12.652(3),b=18.983(4),c=9.102(3),α=97.26(2)°,β=107.38(2)°,γ=102.22(2)° and Z=1.In complex 1,a pair of Cu(Ⅱ) atoms are bridged by carboxylate groups of four ligand molecules with a Cu…Cu distance of 2.738 to form a tetrakis (carboxylato O,O) bridge dimetal core,and the apical coordination positions are occupied by monodentate nitrato anions,which is rare in the structures of similar Cu(Ⅱ) complexes in which the apical ligands are usually neutral molecules.The result shows that introducing the anionic ligands into the coordination sphere of the Cu(Ⅱ) atom significantly increases the Cu…Cu distance.
文摘The complex[Cu (dppe)2](NO3)2 was prepared by the reaction of copper(Ⅱ) nitrate with bis(diphenylphosphino) ethane(dppe) in methanol and its crystal structure was determined by X-ray diffraction.The structure was solved by direct methods and refined by block-diagonal and full-matrix least-squares methods to a final R of 0.043 for 4085 independent reflections of I>3σ(I).The crystal is monoclinic, space group P21/n,Mr=984.41 with cell parameters a=12.896(2),b=22.250(4),c=17.512(5)A,β=101.6(3)°, V=4922.3 A3,Z=4,Dc=1.590 g/cm3,F(000)=1900,μ=10.573 cm-1. In this complex, C52H48CuN2O6P4, dppe functions as a bidentate chelate ligand. The four phosphorus atoms from two dppe are coordinated to the distorted tetrahedral copper.
基金supported by the National Natural Science Foundation of China (21071001)Department of Education Committee of Anhui Province (KJ2010A222)the Natural Science Foundation of Anhui Unversity of Traditional Chinese Medicine (2011zr005A)
文摘A curcumin derivative ligand,1,7-bis(3-methoxyl-4-acetoxyl)phenyl-1,6-heptadiene-3,5-diketone (diacetylcurcumin,abbreviated as HL),and its Cu and Ni complexes have been synthesized and fully characterized by elemental analyses,IR,1 HNMR and molar conductivity.The resulting complexes exhibit two-photon excited fluorescence (TPEF) in DMF,and have been proven to be potentially useful for two-photon microscopy imaging in living cells.In addition,cytotoxicity tests showed that the low-micromolar concentrations of ML 2 did not cause significant reduction in cell viability over a period of at least 24 h and should be safe for further biological studies.
