一维发光镉配位聚合物的合成、晶体结构及识别性能

采用芳香取代的咪唑二羧酸配体2-(对氰基)苯基-4,5-咪唑二羧酸(p-CNPhH₃IDC) ,在含氮螯合配体 2,2'-联吡啶(2,2'-bipy)的存在下,利用水热反应,制备了一个具有混合配体的一维链状配位聚合物:Cd(p-CNPhHIDC)(2,2'-bipy)]_n(1)。 通过元素分析、傅里叶变换红外光谱仪以及单晶X射线衍射等技术手段研究了配位聚合物1的结构和性能。 结果表明,该配位聚合物稳定性较好,在231.6 ℃前结构稳定。 经乙睛、甲醇、乙醛等溶剂浸泡后,配位聚合物1的荧光强度发生了一定程度的减弱(乙醛和CH₂Cl₂)或增强(DMF、硝基苯、丙酮),仅有吡啶溶剂使其荧光发射波长发生了60 nm的蓝移,显示其对吡啶有比较好的识别作用。

Synthesis,Crystal Structure and Recognition Properties of One-Dimensional Luminescent Cd Coordination Polymer

By reaction of an aryl substituted imidazole dicarboxylate ligand 2-(4-cyanophenyl)-1H-imidazole-4,5-dicarboxylic acid(p-CNPhH₃IDC) with cadmium nitrate, in the presence of N-containing chelate ligand, 2,2'-bipyridine(2,2'-bipy), a one-dimensional chain-like coordination polymer, Cd(p-CNPhHIDC)(2,2'-bipy)]_n(1) with mixed ligands was prepared hydrothermally. The structure and properties of the coordination polymer were studied by elemental analysis, Fourier transform infrared spectrometer and single crystal X-ray diffraction. The results show that the coordination polymer has good thermal stability under 231.6 ℃. After being soaked in acetonitrile, methanol, acetaldehyde and other solvents, the fluorescence intensity of coordination polymer 1 was weakened(aldehyde, CH₂Cl₂) or enhanced(DMF, nitrobenzene and acetone) to a certain extent. A 60 nm blue shift in its fluorescence emission, in pyridine indicated a good identification effect on pyridine by this polymer.