Syntheses and structures of tetracopper(ii) complexes with an N-benzoate-N′-[3-(2-hydroxylethylammino)propyl]oxamide ligand: reactivity towards DNA, cytotoxic and antimicrobial activities
作者:Xin Li、Xue-Jie Li、Yan-Tuan Li、Zhi-Yong Wu、Cui-Wei Yan
DOI:10.1039/c2nj40682a
日期:——
Two new tetracopper(II) complexes with formulae of [Cu4(bhpox)2(dabt)2](ClO4)2 (1) and [Cu4(bhpox)2(dmbt)2](ClO4)2·2H2O (2), where H3bhpox stands for N-benzoate-Nâ²-[3-(2-hydroxyl-ethylammino)propyl]oxamide, dabt and dmbt are 2,2â²-diamino-4,4â²-bithiazole and 2,2â²-dimethyl-4,4â²-bithiazole, respectively, have been synthesized and characterized by elemental analyses, molar conductivity measurements, IR and electronic spectral studies and single-crystal X-ray diffraction. The crystal structures reveal that both of the tetracopper(II) complexes are assembled by a pair of oxamido-bridged bicopper(II) units through carboxyl bridges, but the configuration of the μ-oxamido-bridge is cis- in complex 1 while trans- in complex 2. All the copper(II) ions in the two tetranuclear complexes are located in a square-pyramidal environment. Through hydrogen bonds, the two tetracopper(II) complexes 1 and 2 are assembled into a three-dimensional supramolecular structure and a two-dimensional network structure, respectively. The reactivity towards DNA, cytotoxic and antibacterial studies show that both the tetracopper(II) complexes can bind to HS-DNA in the mode of intercalation, and the cytotoxic and antibacterial activities are consistent with their DNA-binding abilities, following the order of 1 < 2. The influence of the substituents on terminal ligands in the two tetracopper(II) complexes on the structure, reactivity towards DNA, cytotoxic and antibacterial activities is preliminarily discussed.
两种新的四铜(II)络合物,其分子式为[Cu4(bhpox)2(dabt)2](ClO4)2 (1) 和[Cu4(bhpox)2(dmbt)2](ClO4)2·2H2O (2),其中 H3bhpox 代表 N-苯甲酸酯-Nα-2-[3-(2-羟基-乙基氨基)丙基]草酰胺,dabt 和 dmbt 分别是 2,2α-二氨基-4,4β-联噻唑和 2,2α 2-二甲基-4,4-联噻唑已分别合成并通过元素分析、摩尔电导率测量、红外和电子光谱研究以及单晶X射线衍射进行表征。晶体结构表明,这两种四铜(II)配合物都是由一对草酰胺桥联的二铜(II)单元通过羧基桥组装而成,但配合物1中的μ-草酰胺桥构型为顺式,而反式为配合物2中。两个四核配合物中的所有铜(II)离子都位于方锥体环境中。通过氢键,两个四铜(II)配合物1和2分别组装成三维超分子结构和二维网络结构。对DNA、细胞毒性和抗菌活性的研究表明,这两种四铜(II)配合物都能以嵌入的方式与HS-DNA结合,并且细胞毒性和抗菌活性与其DNA结合能力一致,遵循1的顺序。 <2.初步探讨了两种四铜(II)配合物末端配体上的取代基对结构、DNA反应性、细胞毒活性和抗菌活性的影响。