Synthesis, crystal structures and biological evaluation of water-soluble zinc complexes of zwitterionic carboxylates
作者:Jin-Xiang Chen、Wei-Er Lin、Chun-Qiong Zhou、Lee Fong Yau、Jing-Rong Wang、Bo Wang、Wen-Hua Chen、Zhi-Hong Jiang
DOI:10.1016/j.ica.2011.06.054
日期:2011.10
Three water-soluble zinc complexes, [Zn(Cbp)(2)Br-2] (1) (Cbp = N-(4-carboxybenzyl)pyridinium), [Zn(BCbpy)(2)(H2O)(4)](3)Br-6 center dot 2(BCbpy)center dot 2(4,4'-bipy)} (2) (BCbpy = 1-(4-carboxybenzyl)-4,4'-bipyridinium) and [Zn-4(Bpybc)(6)(H2O)(12)](OH)(8)center dot 9H(2)O}(2n) (3) (Bpybc = 1,1'-bis(4-carboxybenzyl)-4,4'-bipyridinium), were synthesized and characterized by IR, elemental analysis and single-crystal X-ray crystallography. In complex 1, the central Zn atom adopts a distorted tetrahedral coordination geometry that is formed from two unidentate Cbp ligands and two Br atoms. For complex 2, the Zn atom in [Zn(BCbpy)(2)(H2O)(4)](2+) is strongly coordinated by four water molecules and two N atoms from two BCbpy ligands, hence forming an octahedral geometry. In complex 3, each Bpybc ligand bridges two [Zn(H2O)(3)](2+) units through two terminal carboxylate groups in a monodentate coordination mode, thus forming a flowerlike two-dimensional network. Agarose gel electrophoresis (GE) and ethidium bromide (EB) displacement experiments indicated that complex 3 was capable of converting pBR322 DNA into open circular (OC) and linear forms, and exhibited high binding affinity toward calf-thymus DNA. MTT assay showed that complex 3 displayed inhibitory activities toward the proliferation of lung adenocarcinoma A549 and mouse sarcoma S-180 cells, with the IC50 values being 27.3 and 48.8 mu M, respectively. (C) 2011 Elsevier B.V. All rights reserved.