In order to investigate the thermal stability of nickel(Ⅱ)-based complexes,the semirig-id ligand 1-(4-benzoic acid)-3-(pyrazinyl)-1H-1,2,4-triazole(HL),which contains triazole,pyraz-inyl 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 wa-ter.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 nitro-gen-containing group is to form a strong coordination bond with the transition metal ions to im-prove 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 decom-position 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 parame-ters of a=11.897(3)Å,b=10.207(3)Å,c=30.556(7)Å,α=γ=90°,β=95.064(8)°,and V=3 696.0(17)Å3,and the coordination configuration of the complex 1 is a six-coordinated octahed-ron.Thermogravimetric experiments show that the framework structure of complex 1 is ther-mally stable compared to HL ligand and other nitrogen-containing carboxylic acid complexes.
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