Cu(Ⅱ)-N,N-二(2-羧基苯基)-2,6-吡啶二甲酰胺配合物的光谱性质及结构

Spectroscopic Properties and Structure of the Complex Copper(Ⅱ)-N,N′-Bis(2-carboxylphenyl)-2,6-Pyridine Dicarboxamide

本文通过紫外-可见吸收光谱和荧光光谱，在乙醇溶液中（pH=7～8）研究了Cu（Ⅱ）离子与N，N-二（2-羧基苯基）-2，6-吡啶二甲酰胺（BcPD）的相互作用。结果表明溶液中二者以1：1的化学计量比形成配合物，表观结合常数为（4．59±0．05）×10^6mol^-1·L。由Cu（Ⅱ）离子与BCPD在甲醇中反应合成了1：1型铜配合物[Cu（Ⅱ）（BCPD）]2-·2[（C2H5）3NH]＋·CH3OH，用元素分析、单晶X射线衍射等手段对配合物的结构进行了表征。晶体属于单斜晶系，P21/／c空间群a=1．29090（12）nm，b=1．85519（19）nm，c=1．75231（16）nm，β=122．920（2）°。BCPD以吡啶氮、两个去质子化的酰胺氮原子和2个羧基与Cu（Ⅱ）配位，形成五配位畸变四方锥构型。

In this article, UV-Vis and fluorescent spectra showed that the molar ratio of Cu2＋ to N,N＇-bis（2- carboxylphenyl）-2,6-pyridine diearboxamide（BCPD） in ethanol solution is 1：1 （pH=7-8）, the stable constant was determined to be K=（4.59±0.05）×10^6mol^-1·L. A copper（Ⅱ） complex [Cu（II）（BCPD）]2-·2[（CzHs）3NH]＋.CH3OH has been synthesized by the reaction of Cu（II） to BCPD in methanol. X-ray analysis and elementary analysis indicated that the molar ratio of Cu2＋ to BCPD is l：l. The complex crystallized in a monoclinie system with space group P21/c, a=1.290 90（12） nm, b=1.855 19（19） nm, c=1.752 31（16） nm, β=122.920（2）°. The complex is five-coordinated through nitrogen atoms of the central pyridine ring and the deprotonated earboxamide groups and carboxyl groups, and has coordination geometry of distorted tetragonal pyramid. CCDC： 911182.