基于氮杂环羧酸配体的镍(Ⅱ)配合物的合成、结构及性能研究

Synthesis,structure and properties of Ni(Ⅱ) complex based on N-heterocyclic carboxylate ligand

以1,2-二-(2-1H-咪唑-4,5-二甲酸)苯(H6Phbidc)为配体,在120℃下通过与NiCl_2·6H_2O的自组装,制备了1个新的镍(Ⅱ)配合物[Ni(H_4Phbidc)·2H_2O]·2H_2O·[NH(CH_3)_2](I)。单晶X-射线衍射分析表明,配合物I为正交晶系,Pnma空间群、中心金属离子Ni(Ⅱ)处于1个六配位的八面体配位环境中。对配合物I的红外光谱、粉末衍射图谱、热稳定性以及固态荧光性能进行了研究。结果表明,配合物I在185℃时失去二甲胺、结晶水和配位水,Ni(Ⅱ)离子的存在可以淬灭配合物的荧光。

A new complex with the formula[Ni（ H_4Phbidc）·2 H_2O]·2 H_2O·[NH（CH_3）_2]（ I） is synthesized through the self-assembly of 1,2-bis-（ 2-1 H-imidazole-4,5-dicarboxylate） benzene withNiCl_2·6H_2O at 120 ℃. Single-crystal X-ray analysis reveals that complex I crystallizes in orthorhombic,space group Pnma. Each Ni（ Ⅱ） is six-coordianted and located in a slightly distorted octahedral NiN_2O_4 coordination environment. The infrared spectrum,powder X-ray diffraction patterns,thermal stability and solid-state fluorescence property are also studied. The results show that the complex I loses dimethylamine,uncoordinated and coordinated water molecules at 185 ℃; Ni（ Ⅱ） ions in complex I can quench the fluorescence.