A new complex, [Cd（Himc）2（H2O）2] 1, obtained from imidazole-4-carboxylatic acid （H2imc） and Cd（ClO4）2·6H2O, has been synthesized. The crystal structure was determined by X-ray diffraction. The title compo...A new complex, [Cd（Himc）2（H2O）2] 1, obtained from imidazole-4-carboxylatic acid （H2imc） and Cd（ClO4）2·6H2O, has been synthesized. The crystal structure was determined by X-ray diffraction. The title compound crystallizes in the orthorhombic system, space group Pccn, with a = 7.4886（11）, b = 11.9667（18）, c = 13.550（2） A, V= 1214.3（3） A3, Z = 4, Mr= 370.60, Dc = 2.027 mg/m3, F（000） = 728,μ （MoKa） = 1.829 mm^-1, the final R = 0.0243 and wR = 0.0591 for 1150 unique reflections with I 〉 2σ（I）. The cadmium（II） center in the title complex is coordinated with two oxygen and two nitrogen atoms from two bidentate chelated imidazole-4-carboxlate ligands together with two water molecules, giving a distorted octahedral coordination geometry. A one-dimensional hydrogen bonding chain is formed via intermolecular O-H...O hydrogen bonds, and such adjacent chains are further stacked through intermolecular π-π and hydrogen bonding interactions to form a 3D supramolecular framework. Complex 1 exhibits a fluorescent emission band at 290 nm （λex = 236 nm） in the solid state.展开更多
A new bis（imidazolium） compound,[H2L（H2btec）2]·H4btec（1,L=1,1＇-（butane-1,4-diyl）bis（imidazole）,H4btec=1,2,4,5-benzenetetracarboxylatic acid）,has been synthesized and structurally characterized by singl...A new bis（imidazolium） compound,[H2L（H2btec）2]·H4btec（1,L=1,1＇-（butane-1,4-diyl）bis（imidazole）,H4btec=1,2,4,5-benzenetetracarboxylatic acid）,has been synthesized and structurally characterized by single-crystal X-ray diffraction.The title compound crystallizes in the monoclinic system,space group Pnma,with a=13.3908（11）,b=13.9249（12）,c=16.2166（14）,V=2957.6（4）3,Z=4,Mr=698.55,Dc=1.569 mg/m3,F（000）=1448,μ（MoKα）=0.130 mm-1,the final R=0.0584 and wR=0.1538 for 4295 observed reflections with I2σ（I）.The compound consists of one 1,1＇-（butane-1,4-diyl）bis（imidazolium） cation,one neutral H4btec and one H2btec2-（Only two para carboxyl groups are deprotonated,and two protonated ones remain free） anion.A one-dimensional hydrogen bonding chain and a 2D hydrogen bonding network are formed via intermolecular N–H…O and O–H…O hydrogen bonds.These adjacent chains are further stacked through intermolecular π-π and hydrogen bonding interactions to form a 3D supramolecular network.展开更多
基金supported by the Natural Science Foundation of Henan Province (No.0511022600)the Department of Education of Henan Province (No.200510482006)
文摘A new complex, [Cd（Himc）2（H2O）2] 1, obtained from imidazole-4-carboxylatic acid （H2imc） and Cd（ClO4）2·6H2O, has been synthesized. The crystal structure was determined by X-ray diffraction. The title compound crystallizes in the orthorhombic system, space group Pccn, with a = 7.4886（11）, b = 11.9667（18）, c = 13.550（2） A, V= 1214.3（3） A3, Z = 4, Mr= 370.60, Dc = 2.027 mg/m3, F（000） = 728,μ （MoKa） = 1.829 mm^-1, the final R = 0.0243 and wR = 0.0591 for 1150 unique reflections with I 〉 2σ（I）. The cadmium（II） center in the title complex is coordinated with two oxygen and two nitrogen atoms from two bidentate chelated imidazole-4-carboxlate ligands together with two water molecules, giving a distorted octahedral coordination geometry. A one-dimensional hydrogen bonding chain is formed via intermolecular O-H...O hydrogen bonds, and such adjacent chains are further stacked through intermolecular π-π and hydrogen bonding interactions to form a 3D supramolecular framework. Complex 1 exhibits a fluorescent emission band at 290 nm （λex = 236 nm） in the solid state.
基金supported by the Natural Science Foundation of Henan Province (No 092102310075)
文摘A new bis（imidazolium） compound,[H2L（H2btec）2]·H4btec（1,L=1,1＇-（butane-1,4-diyl）bis（imidazole）,H4btec=1,2,4,5-benzenetetracarboxylatic acid）,has been synthesized and structurally characterized by single-crystal X-ray diffraction.The title compound crystallizes in the monoclinic system,space group Pnma,with a=13.3908（11）,b=13.9249（12）,c=16.2166（14）,V=2957.6（4）3,Z=4,Mr=698.55,Dc=1.569 mg/m3,F（000）=1448,μ（MoKα）=0.130 mm-1,the final R=0.0584 and wR=0.1538 for 4295 observed reflections with I2σ（I）.The compound consists of one 1,1＇-（butane-1,4-diyl）bis（imidazolium） cation,one neutral H4btec and one H2btec2-（Only two para carboxyl groups are deprotonated,and two protonated ones remain free） anion.A one-dimensional hydrogen bonding chain and a 2D hydrogen bonding network are formed via intermolecular N–H…O and O–H…O hydrogen bonds.These adjacent chains are further stacked through intermolecular π-π and hydrogen bonding interactions to form a 3D supramolecular network.
