基于(1-甲基-1H-苯并咪唑-2-基)甲醇构筑的三个Zn(Ⅱ)配合物的合成、晶体结构和荧光分析

Synthesis,structure and fluorescence analysis of three Zn􀃭complexes based on(1‑methyl‑1H‑benzimidazol‑2‑yl)methanol

(1-甲基-1H-苯并咪唑-2-基)甲醇(HL)分别与Zn(NO_(3))_(2)·6H_(2)O和ZnCl_(2)在甲醇和乙腈混合溶液中反应,生成了3个Zn(Ⅱ)配合物[Zn(HL)_(2)Cl_(2)](1)、[Zn(HL)_(2)(H_(2)0)_(2)](NO_(3))_(2)(2)和[Zn_(4)(L)_(4)Cl_(4)](3)。利用元素分析、IR、热重和单晶X射线衍射对它们的结构进行分析,测试结果表明1和2是单核配合物,3属于四核配合物。热重分析结果表明,这些配合物具有良好的热稳定性,当温度超过180℃时结构才开始分解。荧光分析表明配合物1和2发生了红移现象,当配体失去质子H后,配合物3发生了明显的蓝移现象。配合物1、2和3的量子产率分别为1.00%、0.78%和2.04%,荧光寿命分别为2.3060、2.2836和3.0399 ns。因此,可以通过使配体失去质子H形成多核配合物来增强荧光寿命。

The(1‑methyl‑1H‑benzimidazol‑2‑yl)methanol(HL)reacted with Zn(NO_(3))_(2)·6H_(2)O and ZnCl_(2)in a mixture of methanol and acetonitrile to generate three Zn􀃭complexes:[Zn(HL)_(2)Cl_(2)](1)、[Zn(HL)_(2)(H_(2)0)_(2)](NO_(3))_(2)(2),and[Zn_(4)(L)_(4)Cl_(4)](3).Their structures were analyzed by elemental analysis,IR,thermogravimetry,and single‑crystal X‑ray diffraction.The results show that 1 and 2 are mononuclear complexes,and 3 is a tetranuclear complex.The thermogravimetric analysis results show that these complexes had good thermal stability and the structure began to decompose when the temperature exceeded 180℃.The fluorescence analysis shows that complexes 1 and 2 had a red shift phenomenon,and when the ligand lost proton H,complex 3 had a significant blue shift phenomenon.The quantum yields of complexes 1,2,and 3 were 1.00%,0.78%,and 2.04%,respectively.And the fluorescence lifetimes were 2.3060,2.2836,and 3.0399 ns,respectively.Therefore,it is possible to enhance the fluorescence lifetime by causing the ligand to lose proton H and form a polynuclear complex.CCDC:2183318,1;22500007,2;2183319,3.