Abstract Schiff-base ligand, 2,6-bis(benzimino)-4-phenyl-1,3,5-triazine (L), and its transition metal complexes of Co(ii), Ni(ii), and Cu(ii) were synthesized by refluxing the reaction mixture and its analytical, spectral, and thermogravimetric characteristics were explored by various techniques: AAS, FT-IR, UV-vis, TG-DTG, CHNS/O, and VSM. It was observed that all the metal containing complexes are non-electrolytic, mononuclear, and paramagnetic in nature, confirmed by the molar conductance and magnetic susceptibility measurements. Optical spectral data were used to investigate the geometrical and spectral parameters of [Co(L)(ac)2], [Ni(L)(ac)2], [Cu(L)(ac)2], [Cu(L)(acac)2], and [Cu(L)(fmc)2] complexes. Simultaneous thermal analyses (TG-DTG) in nitrogen atmosphere reveal that the ligand decomposes in one step, [Co(L)(ac)2], [Ni(L)(ac)2], and [Cu(L) (ac)2] complexes are decomposed in three steps, whereas [Cu(L)(acac)2] and [Cu(L) (fmc)2] are decomposed in five and two steps, respectively. In addition, activation energy (E a) and pre-exponential factor (ln A) were evaluated by TG-DTG decomposition steps of compounds using the Coats–Redfern formula. Enthalpy (∆H), entropy (∆S), and Gibbs free energy (∆G) of the as-prepared metal complexes were also speculated by various thermodynamic equations.

中文翻译：

---

席夫碱衍生金属配合物的合成、光谱和热动力学研究

摘要 Schiff 碱配体、2,6-双(苯并氨基)-4-苯基-1,3,5-三嗪 (L) 及其 Co(ii)、Ni(ii) 和 Cu(ii) 的过渡金属配合物) 通过回流反应混合物合成，并通过各种技术探索其分析、光谱和热重特性：AAS、FT-IR、UV-vis、TG-DTG、CHNS/O 和 VSM。观察到所有含金属的配合物本质上都是非电解的、单核的和顺磁性的，这通过摩尔电导和磁化率测量得到证实。光谱数据用于研究 [Co(L)(ac)2]、[Ni(L)(ac)2]、[Cu(L)(ac)2]、[Cu(L) )(acac)2] 和 [Cu(L)(fmc)2] 络合物。氮气氛中的同步热分析 (TG-DTG) 显示配体一步分解，[Co(L)(ac)2]、[Ni(L)(ac)2]、和 [Cu(L) (ac)2] 配合物分三步分解，而 [Cu(L)(acac)2] 和 [Cu(L) (fmc)2] 分别分五步和两步分解。此外，使用 Coats-Redfern 公式通过化合物的 TG-DTG 分解步骤评估活化能 (E a) 和指前因子 (ln A)。所制备的金属配合物的焓 (∆H)、熵 (∆S) 和吉布斯自由能 (∆G) 也可通过各种热力学方程推测。