1-(4-苯甲酸)-3-(吡嗪基)-1H-1,2,4-三唑配体镍(Ⅱ)配合物的构筑与热分解性能

Construction and thermal decomposition properties of Nickel(Ⅱ)complex with 1-(4-benzoic acid)-3-(pyrazinyl)-1H-1,2,4-triazole ligand

为了探究镍(Ⅱ)基配合物的热稳定性,选择同时含有三氮唑、吡嗪基和羧基的半刚性配体1-(4-苯甲酸)-3-(吡嗪基)-1H-1,2,4-三唑(HL)与过渡金属镍(Ⅱ)在乙腈、硝酸、水等混合溶剂环境下反应生长晶体。配体(HL)中的羧酸基团通过与金属离子形成的金属-羧基结构单元促进配合物的结构更加多样化,而含氮基团是通过与过渡金属离子形成强配位键来提高配合物的稳定性。通过传统的溶剂热法成功构筑了一例命名为1的新型镍(Ⅱ)基配合物,并对配合物1进行单晶结构分析、粉末XRD实验、FTIR检测等表征,通过热重实验分析热分解性能。单晶结构分析表明,配合物1属于单斜晶系,C 2/c空间群,其晶胞参数为a=11.897(3)A,b=10.207(3)A,c=30.556(7)A,α=γ=90°,β=95.064(8)°,V=3696.0(17)A^(3),配合物1的配位构型是一个六配位的八面体;热重实验表明,相比于HL配体和其他含氮羧酸类配合物,配合物1的框架结构热稳定性较高。

In order to investigate the thermal stability of nickel(Ⅱ)-based complexes,the semirigid ligand 1-(4-benzoic acid)-3-(pyrazinyl)-1H-1,2,4-triazole(HL),which contains triazole,pyrazinyl and carboxylic acid groups at the same time,was chosen to grow crystals by reacting with nickel(Ⅱ),a transition metal,in a mixed-solvent environment of acetonitrile,nitric acid and water.The carboxylic acid group in the ligand(HL)promotes a more diversified structure of the complex through the metal-carboxylic structural unit formed with the metal ions,while the nitrogen-containing group is to form a strong coordination bond with the transition metal ions to improve the stability of the complex.A novel nickel(Ⅱ)-based complex named 1 was successfully constructed by the conventional solvothermal method,and the complex 1 was characterized by single-crystal structure analysis,powder XRD experiments,FTIR detection,and thermal decomposition properties by thermogravimetric experiments.Single-crystal structure analysis shows that the complex 1 belongs to the monoclinic crystal system,C2/c space group,with cell parameters of a=11.897(3)A,b=10.207(3)A,c=30.556(7)A,α=γ=90°,β=95.064(8)°,and V=3696.0(17)A^(3),and the coordination configuration of the complex 1 is a six-coordinated octahedron.Thermogravimetric experiments show that the framework structure of complex 1 is thermally stable compared to HL ligand and other nitrogen-containing carboxylic acid complexes.