Multiwavelength spectrophotometric-thermodynamic studies of complexation reactions of newly synthesized triazenes with Hg2+, Pb2+, Zn2+, and Cd2+ in MeOH, EtOH, DMF, and DMSO
作者:Mohammad Kazem Rofouei、Jahan B. Ghasemi、Leila Arjomandi-Behzad、Hassan Behnejad
DOI:10.1016/j.molliq.2022.119145
日期:2022.7
at various temperatures. Stability constants (K1 and K2) and stoichiometries of formed adducts (1:1 and 1:2 ligand to metal ion) were calculated by computer refinement of experimental spectral mole ratio data by SQUAD program. The results indicated that the donor number, dielectric constant, the acceptor number of the solvents play an important role in the complex stability. Besides, the shape and size
用分光光度法研究了Hg 2+、Pb 2+、Zn 2+和Cd 2+阳离子与四种新合成的三氮烯配体在不同温度下在非水溶剂(MeOH、EtOH、DMF 和DMSO)中的络合反应。通过 SQUAD 程序对实验光谱摩尔比数据进行计算机改进,计算了形成的加合物(1:1 和 1:2 配体与金属离子)的稳定性常数(K 1和 K 2 )和化学计量。结果表明,溶剂的施主数、介电常数、受主数对配合物的稳定性有重要影响。此外,溶剂分子的形状和大小是研究反应的重要因素。对数 β 之间从图1和 log β 2可以看出,大多数配合物在不同条件下呈线性关系。Van't Hoff 方程用于根据地层常数对温度的依赖性计算 ΔG°、ΔS° 和 ΔH°。在计算不同温度下的热力学数据后,从 TΔS° - ΔH° 图中获得了良好的线性相关性,从而对络合反应进行了熵-焓补偿。