Two new Cu（II） coordination polymers, [Cu（FDA）（BPY）（H20）]n （1） and {[Cu（FDA）（BPY）（H2O）].2H2O}n （2） （H2FDA = 2,5-furandicarboxylic acid, BPY = 2,2＇-bipyridine）, have been synthesized and structural...Two new Cu（II） coordination polymers, [Cu（FDA）（BPY）（H20）]n （1） and {[Cu（FDA）（BPY）（H2O）].2H2O}n （2） （H2FDA = 2,5-furandicarboxylic acid, BPY = 2,2＇-bipyridine）, have been synthesized and structurally characterized by single-crystal X-ray diffraction as well as elemental analysis and IR. Compound 1 crystallizes in monoclinic, space group P21/c, with a = 7.5915（15）, b = 8.4050（17）, c = 24.204（6） A, β = 99.05（3）°, V= 1525.1（6） A3, Dc = 1.706 g/crn3, C16HI2CuN206, Mr = 391.82, F（000） = 796, μ（MoKa） = 1.470 mm-l, Z = 4, R = 0.0633 and wR = 0.1059 for 2389 observed reflections （1 〉 2a（I））, R = 0.0738, and wR = 0.1098 for all data. Complex 2 belongs to triclinic space group PI with a = 8.8660（18）, b = 8.9112（18）, c = 12.525（3） A, a = 88.41（3）, β = 69.38（3）, γ = 66.95（3）°, V = 845.2（3） A3, Dc = 1.681 g/cm3, CI6HI6CuN2Os, Mr. = 427.85, F（000） = 438, μ（MoKα） = 1.342 mm-1, Z = 2, R = 0.0290 and wR = 0.0690 for 2767 observed reflections （I 〉 2σ（I））, R = 0.0329 and wR = 0.0706 for all data. Complexes 1 and 2 are both coordination polymers with one-dimensional chain structures bridged by the protonated FDA ligands, which are assembled into three-dimensional supramolecular structures through hydrogen bonding interactions and π-π packing interactions between the chains.展开更多
Bimetallic Pd-Cu/Al_(2)O_(3) was prepared by wetness impregnation method and its catalytic activity on coupling reaction of pyridine to 2,2'-bipyridine was assessed in view of the effects of different molar ratios...Bimetallic Pd-Cu/Al_(2)O_(3) was prepared by wetness impregnation method and its catalytic activity on coupling reaction of pyridine to 2,2'-bipyridine was assessed in view of the effects of different molar ratios of Pd:Cu.It is found that Pd-Cu/Al_(2)O_(3) has the small particle size and good dispersion through the characterization.Compared with Pd/Al_(2)O_(3),Pd-Cu(1:2)/Al_(2)O_(3) is the preferable catalyst under the optimum conditions of 1 MPa N2 pressure,310℃and 16 h.The conversion of pyridine is 35.4%,and the selectivity for 2,2'-Bipyridine is up to 99%,which is much higher activity than Pd/Al_(2)O_(3).The directly coupled synthesis meets the requirements of the atomic economy better.The addition of Cu also reduces the dosage of Pd and lowers the cost.It is worth noting that the recycled Pd-Cu/Al_(2)O_(3) catalyst still shows high activity and stability after three times.展开更多
Three new crystalline compounds 1-3 were successfully obtained by the reactions of 3,3＇-dimethoxy-6,6＇-dimethyl-2,2＇-bipyridine ligand（dmbp） with the corresponding Cu（Ⅰ） salts.Crystal data for 1：orthorhombic ...Three new crystalline compounds 1-3 were successfully obtained by the reactions of 3,3＇-dimethoxy-6,6＇-dimethyl-2,2＇-bipyridine ligand（dmbp） with the corresponding Cu（Ⅰ） salts.Crystal data for 1：orthorhombic Pbca,a = 18.5858（12）,b = 8.1821（5）,c = 20.6066（13） ,V = 3133.7（3） 3,Z = 8,Dc = 1.843 g/cm3,F（000） = 1696,μ = 3.366 mm-1,the final R = 0.0223 and wR = 0.0542.Crystal data for 2：Orthorhombic Pbca,a = 18.7883（16）,b = 8.3249（7）,c = 19.0294（17） ,V = 2976.4（4） 3,Z = 8,Dc = 1.731 g/cm3,F（000） = 1552,μ = 4.154 mm-1,the final R = 0.0279 and wR = 0.0680.Crystal data for 3：monoclinic P21/c,a = 13.812（10）,b = 9.910（7）,c = 23.444（17） ,β = 104.3350（10）°,V = 3090（4） 3,Z = 4,Dc = 1.476 g/cm3,F（000） = 1408,μ = 1.588 mm-1,the final R = 0.0479 and wR = 0.1081.The results of X-ray crystallographic analysis revealed that C14H16ICuN2O2（1） and C14H16BrCuN2O2（2） are isostructural compounds with the dimers connected by C-H···halogen hydrogen bonds to generate a three-dimensional（3D） supramolecular network in 1 and a two-dimensional（2D） sheet structure in 2,respectively,while the mononuclear complex C28H32Cl2Cu2N4O4（3） is ionic.In 3,the [Cu（dmbp）2]＋ cations and [ClCuCl]-anions are connected by C-H···Cl hydrogen bonds to form a one-dimensional（1D） chain along the a axis.Therefore,in the three complexes,the C-H···halogen hydrogen bonds dominate their crystal structures.Additionally,The UV luminescent properties of complexes 1-3 were investigated.展开更多
A new mononuclear copper (II) complex, [Cu(dbpy)2Cl]OH0.5CH3OH2H2O (dbpy = 4,4?dimethyl-2,2?bipyridine) (C24.50H31ClCuN4O3.50, Mr = 536.52) has been synthesized and its crystal structure was determined by X-ray diffra...A new mononuclear copper (II) complex, [Cu(dbpy)2Cl]OH0.5CH3OH2H2O (dbpy = 4,4?dimethyl-2,2?bipyridine) (C24.50H31ClCuN4O3.50, Mr = 536.52) has been synthesized and its crystal structure was determined by X-ray diffraction method. It crystallizes in monoclinic, space group P2/c with a = 13.383(6), b = 7.653(3), c = 14.164(6) ? b = 105.395(8), V = 1398.7(10) 3, Z = 2, Dc = 1.274 g/cm3, m = 0.908 mm-1, F(000) = 560 and R = 0.0773 for 1467 observed reflections with I>2s(I). Each copper(II) ion is coordinated by two dbpy and one Cl- ion and the coordination geometry can be described as a distorted trigonal bipyramidal arrange- ment.展开更多
基金Supported by the National Natural Science Foundation of China(21031002 and 51073079)the Fundamental Research Funds for the Central Universitiesthe Application and Research in Cutting-edge Technologies in Tianjin Technology Projects in General(K11JCYBJC11100)
文摘Two new Cu（II） coordination polymers, [Cu（FDA）（BPY）（H20）]n （1） and {[Cu（FDA）（BPY）（H2O）].2H2O}n （2） （H2FDA = 2,5-furandicarboxylic acid, BPY = 2,2＇-bipyridine）, have been synthesized and structurally characterized by single-crystal X-ray diffraction as well as elemental analysis and IR. Compound 1 crystallizes in monoclinic, space group P21/c, with a = 7.5915（15）, b = 8.4050（17）, c = 24.204（6） A, β = 99.05（3）°, V= 1525.1（6） A3, Dc = 1.706 g/crn3, C16HI2CuN206, Mr = 391.82, F（000） = 796, μ（MoKa） = 1.470 mm-l, Z = 4, R = 0.0633 and wR = 0.1059 for 2389 observed reflections （1 〉 2a（I））, R = 0.0738, and wR = 0.1098 for all data. Complex 2 belongs to triclinic space group PI with a = 8.8660（18）, b = 8.9112（18）, c = 12.525（3） A, a = 88.41（3）, β = 69.38（3）, γ = 66.95（3）°, V = 845.2（3） A3, Dc = 1.681 g/cm3, CI6HI6CuN2Os, Mr. = 427.85, F（000） = 438, μ（MoKα） = 1.342 mm-1, Z = 2, R = 0.0290 and wR = 0.0690 for 2767 observed reflections （I 〉 2σ（I））, R = 0.0329 and wR = 0.0706 for all data. Complexes 1 and 2 are both coordination polymers with one-dimensional chain structures bridged by the protonated FDA ligands, which are assembled into three-dimensional supramolecular structures through hydrogen bonding interactions and π-π packing interactions between the chains.
基金by the Natural Science Foundation of the Higher Education Institutions of Anhui Province(No.KJ2021A0132)the Key Research and Development Program of Anhui Province(No.202104a05020070)the National and Anhui Province College Student Innovation Training Program(Nos.202110364055 and S202010364145)。
文摘Bimetallic Pd-Cu/Al_(2)O_(3) was prepared by wetness impregnation method and its catalytic activity on coupling reaction of pyridine to 2,2'-bipyridine was assessed in view of the effects of different molar ratios of Pd:Cu.It is found that Pd-Cu/Al_(2)O_(3) has the small particle size and good dispersion through the characterization.Compared with Pd/Al_(2)O_(3),Pd-Cu(1:2)/Al_(2)O_(3) is the preferable catalyst under the optimum conditions of 1 MPa N2 pressure,310℃and 16 h.The conversion of pyridine is 35.4%,and the selectivity for 2,2'-Bipyridine is up to 99%,which is much higher activity than Pd/Al_(2)O_(3).The directly coupled synthesis meets the requirements of the atomic economy better.The addition of Cu also reduces the dosage of Pd and lowers the cost.It is worth noting that the recycled Pd-Cu/Al_(2)O_(3) catalyst still shows high activity and stability after three times.
基金supported by the National Natural Science Foundation of China (No.20872057)
文摘Three new crystalline compounds 1-3 were successfully obtained by the reactions of 3,3＇-dimethoxy-6,6＇-dimethyl-2,2＇-bipyridine ligand（dmbp） with the corresponding Cu（Ⅰ） salts.Crystal data for 1：orthorhombic Pbca,a = 18.5858（12）,b = 8.1821（5）,c = 20.6066（13） ,V = 3133.7（3） 3,Z = 8,Dc = 1.843 g/cm3,F（000） = 1696,μ = 3.366 mm-1,the final R = 0.0223 and wR = 0.0542.Crystal data for 2：Orthorhombic Pbca,a = 18.7883（16）,b = 8.3249（7）,c = 19.0294（17） ,V = 2976.4（4） 3,Z = 8,Dc = 1.731 g/cm3,F（000） = 1552,μ = 4.154 mm-1,the final R = 0.0279 and wR = 0.0680.Crystal data for 3：monoclinic P21/c,a = 13.812（10）,b = 9.910（7）,c = 23.444（17） ,β = 104.3350（10）°,V = 3090（4） 3,Z = 4,Dc = 1.476 g/cm3,F（000） = 1408,μ = 1.588 mm-1,the final R = 0.0479 and wR = 0.1081.The results of X-ray crystallographic analysis revealed that C14H16ICuN2O2（1） and C14H16BrCuN2O2（2） are isostructural compounds with the dimers connected by C-H···halogen hydrogen bonds to generate a three-dimensional（3D） supramolecular network in 1 and a two-dimensional（2D） sheet structure in 2,respectively,while the mononuclear complex C28H32Cl2Cu2N4O4（3） is ionic.In 3,the [Cu（dmbp）2]＋ cations and [ClCuCl]-anions are connected by C-H···Cl hydrogen bonds to form a one-dimensional（1D） chain along the a axis.Therefore,in the three complexes,the C-H···halogen hydrogen bonds dominate their crystal structures.Additionally,The UV luminescent properties of complexes 1-3 were investigated.
基金This work was supported by the National Natural Science Foundation of China(No.20371028)Natural Science Foundation of Tianjin(No.023605811)
文摘A new mononuclear copper (II) complex, [Cu(dbpy)2Cl]OH0.5CH3OH2H2O (dbpy = 4,4?dimethyl-2,2?bipyridine) (C24.50H31ClCuN4O3.50, Mr = 536.52) has been synthesized and its crystal structure was determined by X-ray diffraction method. It crystallizes in monoclinic, space group P2/c with a = 13.383(6), b = 7.653(3), c = 14.164(6) ? b = 105.395(8), V = 1398.7(10) 3, Z = 2, Dc = 1.274 g/cm3, m = 0.908 mm-1, F(000) = 560 and R = 0.0773 for 1467 observed reflections with I>2s(I). Each copper(II) ion is coordinated by two dbpy and one Cl- ion and the coordination geometry can be described as a distorted trigonal bipyramidal arrange- ment.
