A flexible carboxylate EGTA(ethylene bis(oxyethylenenitrilo)tetraacetic acid)ligand was used to construct four coordination polymers,namely,{[Cd_(3)(EGTA)(NO_(3))_(2)(H_(2)O)_(6)]·H_(2)O}_(n)1,{[Cd_(5)(EGTA)_(2)(...A flexible carboxylate EGTA(ethylene bis(oxyethylenenitrilo)tetraacetic acid)ligand was used to construct four coordination polymers,namely,{[Cd_(3)(EGTA)(NO_(3))_(2)(H_(2)O)_(6)]·H_(2)O}_(n)1,{[Cd_(5)(EGTA)_(2)(bpy)_(4)(H_(2)O)_(4)]bpy·(NO_(3))_(2)·(H_(2)O)_(8)}_(n)2,{[Cd_(3)(EGTA)(1,2-dpe)1.5(H_(2)O)_(3)](NO_(3))_(2)(H_(2)O)_(6)}_(n)3 and{[Cd_(2)(EGTA)(dpe)(H_(2)O)]·(H_(2)O)_(4)}_(n)4,bearing N-donor pyridyl co-linkers 4,4’-bipyridine(bpy),1,2-di(4-pyridyl)ethane(1,2-dpe)and 1,2-di(4-pyridyl)ethylene(dpe),under solvothermal conditions.Complexes were characterized by spectroscopic and single crystal X-ray diffraction techniques to explore binding manners,geometries,dimensions and involvement of non-covalent interactions in stabilization of the structure.Complexes 1 and 3 afforded 1D zigzag infinite chain structure stabilized by hydrogen bonding of co-crystallized water molecule with uninodal 2C1 and 2,2,4C3 topologies,respectively.In contrast,complexes 2 and 4 displayed 3D sheet frameworks with 4,6-c net-connected fsc and sqc11 and uninodal 6-c net connected rob topologies,respectively.Cd(II)exhibits rare distorted trigonal pyramidal geometrical configuration in complex 3.The complexes also show solid state emission properties.Furthermore,evaluation of dye adsorption properties of complexes indicates that complexes 2 and 3 selectively adsorb anionic dyes(methyl orange and Congo red)quickly(within 30 and 90 minutes,respectively),while complex 4 adsorbs anionic dye in a longer time(∼24 h).The adsorption capabilities of complexes 2 and 3 are stronger,possibly owing to the cationic nature of the complexes and greater non-covalent interactions compared to complex 4.展开更多
基金Financial assistance received from the SERB,New Delhi,India[SB/FT/CS-188/2013]is gratefully acknowledged.
文摘A flexible carboxylate EGTA(ethylene bis(oxyethylenenitrilo)tetraacetic acid)ligand was used to construct four coordination polymers,namely,{[Cd_(3)(EGTA)(NO_(3))_(2)(H_(2)O)_(6)]·H_(2)O}_(n)1,{[Cd_(5)(EGTA)_(2)(bpy)_(4)(H_(2)O)_(4)]bpy·(NO_(3))_(2)·(H_(2)O)_(8)}_(n)2,{[Cd_(3)(EGTA)(1,2-dpe)1.5(H_(2)O)_(3)](NO_(3))_(2)(H_(2)O)_(6)}_(n)3 and{[Cd_(2)(EGTA)(dpe)(H_(2)O)]·(H_(2)O)_(4)}_(n)4,bearing N-donor pyridyl co-linkers 4,4’-bipyridine(bpy),1,2-di(4-pyridyl)ethane(1,2-dpe)and 1,2-di(4-pyridyl)ethylene(dpe),under solvothermal conditions.Complexes were characterized by spectroscopic and single crystal X-ray diffraction techniques to explore binding manners,geometries,dimensions and involvement of non-covalent interactions in stabilization of the structure.Complexes 1 and 3 afforded 1D zigzag infinite chain structure stabilized by hydrogen bonding of co-crystallized water molecule with uninodal 2C1 and 2,2,4C3 topologies,respectively.In contrast,complexes 2 and 4 displayed 3D sheet frameworks with 4,6-c net-connected fsc and sqc11 and uninodal 6-c net connected rob topologies,respectively.Cd(II)exhibits rare distorted trigonal pyramidal geometrical configuration in complex 3.The complexes also show solid state emission properties.Furthermore,evaluation of dye adsorption properties of complexes indicates that complexes 2 and 3 selectively adsorb anionic dyes(methyl orange and Congo red)quickly(within 30 and 90 minutes,respectively),while complex 4 adsorbs anionic dye in a longer time(∼24 h).The adsorption capabilities of complexes 2 and 3 are stronger,possibly owing to the cationic nature of the complexes and greater non-covalent interactions compared to complex 4.
