名称:
Studies on one 2D cadmium(II) coordination polymer and two mononuclear cadmium(II) complexes with trans or cis configuration having 3-bromo, 3,6-dibromo, and 3,8-dibromo 1,10-phenanthroline ligands
摘要:
Three novel Cd(II) complexes, formulated as [Cd(3,8-dibromo-1,10-phen-(KN)-N-2,N'(L-tar)](n) (1), trans-[Cd(3,8-dibromo-1,10-phen-(KN)-N-2,N')(2)(NO3-(KO)-O-2,O')(2)]center dot(CH3CN) (2) and cis-[Cd(3,6-dibromo-1,10-phen-(KN)-N-2,N')(3-bromo-1,10-phen-(KN)-N-2,N')(NO3-O-2,O')(CH3OH-KO)](NO3) (3) (phen = phenanthroline, L-tarH(2) = L-tartaric acid), have been synthesized and characterized in this paper. In coordination polymer 1, the [Cd-2(3,8-dibromo-phen)2](4+) cations are bridged by L-tar ligands into an infinite 2D lamellar polymer along the c-axis, and the neighboring 2D polymers are further extended into a 3D supramolecular network by pi-pi stacking interactions. Complexes 2 and 3 are both mononuclear cadmium complexes but with different conformation (trans or cis). In the crystal packing structures of 2 and 3, molecules are arranged into three-dimensional (3D) frameworks by intermolecular hydrogen bonding and pi-pi stacking interactions. (C) 2008 Elsevier B.V. All rights reserved.