| 基于2-(4'-羧基苯基)咪唑-4,5-二羧酸构筑的三个镉/锌配位聚合物的合成、拓扑结构、荧光光谱及DNA作用 |
| Three Cd(II) and Zn(II) Coordination Polymers Based on 2-(4'-Carboxyphenyl)-1H-imidazole-4,5-dicarboxylic Acid: Syntheses, Topological Structures, Fluorescent Spectra and DNA Binding |
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| 摘要: 以2-（4'-羧基苯基）咪唑-4，5-二羧酸（H4CPhIDC，C12H8N2O6）为配体，用溶剂热合成了3种配位聚合物{[Cd2（CPhIDC）（bimb）]·H2O}n（1）、{[Cd2（CPhIDC）（phen）2]·3H2O}n（2）、{[Zn2（CPhIDC）（bpp）]·1.5H2O}n（3）（bimp=1，4-双咪唑基-丁烷，phen=1，10-菲咯啉，bpp=1，3-双（4-吡啶基）-丙烷）。用元素分析、红外光谱、粉末X射线衍射和单晶X射线衍射对配合物进行了表征和结构分析。结构分析表明，主配体以完全去质子化CPhIDC4-的形式与中心金属离子形成以μ4和μ5为配位模式的二维及三维聚合物。配合物1和3是三维网络结构，同时呈现（3，4，5）-连接的（5·6·7）（4·52·6·72）（4·52·6·74·82）拓扑结构，两者的不同之处是中心离子和辅助配体。配合物2是二维波纹状渔网结构，呈现44·62拓扑结构，在其空间填充上又类似于DNA双螺旋链的单螺旋结构。测定了产物的固体荧光光谱；用EtBr荧光探针法研究了配体及配合物与ct-DNA的相互作用。 |
| 关键词: 2-(4'-羧基苯基)咪唑-4,5-二羧酸 镉/锌配位聚合物 拓扑结构 荧光光谱 DNA作用 |
| 基金项目: 浙江省自然科学基金（LY12B01003）资助项目。 |
| Abstract: Three coordination polymers of cadmium and zinc {[Cd2(CPhIDC)(bimb)]·H2O}n (1), {[Cd2(CPhIDC)(phen)2]·3H2O}n (2), {[Zn2(CPhIDC)(bpp)]·1.5H2O}n (3), (H4CPhIDC=2-(4'-carboxyphenyl)-1H-imidazole-4,5-dicar-boxylic acid, bimb=1,4-bis(imidazol-1-yl)butane, phen=1,10-phenanthroline, bpp=1,3-di(pyridin-4-yl)propane) have been synthesized by solvothermal reaction and characterized by IR, EA and PXRD. Single crystal X-ray diffraction shows that the H4CPhIDC ligand presents fully deprotonated motifs of CPhIDC4- in three corresponding polymers. Moreover, the fully deprotonated ligands coordinate in the μ4 and μ5 manner to generate 2D and 3D polymers, displaying three different coordination modes. Complexes 1 and 3 exhibit 3D structures with (3,4,5)-connected frameworks with (5·6·7)(4·52·6·72)(4·52·6·74·82) topology, but the metal ions and auxiliary ligands are different. 2 displays a 2D wave-like fishing nets structure with 44·62 topology. The fluorescence spectra in the solid state and DNA binding properties of the polymers and ligand are investigated. |
| Keywords: 2-(4'-carboxyphenyl)-1H-imidazole-4,5-dicarboxylic acid Cd and Zn coordination polymers topological structure fluorescence spectra DNA binding |
| 投稿时间：2017-09-17 修订日期：2018-04-26 |
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| 严世承,武大令,张敏芝,管全银,赵国良.基于2-(4'-羧基苯基)咪唑-4,5-二羧酸构筑的三个镉/锌配位聚合物的合成、拓扑结构、荧光光谱及DNA作用[J].无机化学学报,2018,34(6):1110-1120. |
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