由联苯-2,4,4′,6-四甲酸构筑的三维镉配位聚合物的合成、结构及与DNA作用

Syntheses, Structures and DNA-Binding of Cadmium Coordination Polymers with 3D Frameworks Constructed by Biphenyl-2,4,4′,6-tetracarboxylic Acid

在水热条件下,以联苯-2,4,4′,6-四甲酸(C16H10O12,H4bptc)为主配体、1,3-二(4-吡啶基)-丙烷(bpp)为辅助配体,与氯化镉(Cd Cl2·2.5H2O)反应合成了2个三维镉配位聚合物{[Cd2(bptc)(H2O)3]·H2O}n(1),{[Cd2(bptc)(bpp)·H2O]·2.25H2O}n(2)。用元素分析、红外光谱对配合物的组成及结构进行了表征,并通过X射线单晶衍射的方法测定了配合物的晶体结构。配合物1具有双核结构,2个中心离子Cd(Ⅱ)同为六配位,均形成略有畸变的八面体结构;而配合物2尽管也具有双核结构,但不同于1的是其中一个中心离子构成略显畸变的八面体几何结构,另一个却构成五角双锥结构。用溴化乙锭荧光光谱法测定了配体和配合物与DNA作用情况,结果表明配合物与DNA的作用强于配体。

Two new cadmium coordination polymers, {[Cd2（bptc） （H2O）3] ·H2O}n （1） and {[Cd2（bptc）（bpp）·H2O]· 2.25H2O}n （2）, were synthesized under hydrothermal reactions by using biphenyl-2,4,4＇,6-tetracarboxylic acid （H4bptc）, CdCl2·2.5H2O and 1,3-di（4-pyridyl）propane（bpp）. Both of them were characterized by elemental analysis, IR spectra, single crystal X-ray diffraction. Complex 1 is a binuclear structure with two six-coordinated Cd（Ⅱ）, both of which are distorted octahedral structures. The binuclear of Complex 2 is different. One Cd（Ⅱ） is distorted octahedral, and the other is seven-coordinated to form a pentagonal bipyramid. The interaction between two complexes, ligand and DNA was studied by EtBr fluorescence probe. Photoluminescence studies revealed that the interaction of complex 2 to the DNA is stronger than complex 1. CCDC： 952960, 1; 952962, 2.