Solvents Influence Upon Complex Formation of 7-Chloro-4-hydrazinoquinoline Schiff Base Ligand and Transition Metal(II) by Using Conductometric Method
作者:M. El-Batouti、G. Nawmosy、E.H. El-Mossalamy
DOI:10.14233/ajchem.2016.19394
日期:——
7-Chloro-4-hydrazinoquinoline Schiff base was synthesized and characterized by elemental analyses, IR, 1H NMR, electronic spectra and mass spectrometry. The complex formation of Schiff base hydrazone ligand with Co(II), Ni(II), Cd(II), Zn(II), Cu(II) and Fe(III) in 75 % (v/v) ethanol-water, acetone-water and isopropanol-water mixtures at 30, 40 and 50 °C, assigned that the ligand behaves as a monoprotic. The stability constants of the formed complexes decreased with increasing temperature, reflecting that the complexation process is an exothermic process. Thermodynamics parameters are computed and analyzed in order to investigate the bond character between metal and ligand. The calculated values for DG, DH and DS suggested that the complexation process is spontaneous. The calculated dissociation constant of ligand (HL) depends on the relation between the basicity of the ligand and dielectric constant of different solvents.
7-氯-4-肼基喹啉Schiff碱通过元素分析、红外光谱、1H NMR、电子光谱和质谱进行了合成和表征。在75%(v/v)乙醇-水、丙酮-水和异丙醇-水混合物中,分别在30℃、40℃和50℃下,Schiff碱肼酮配体与Co(II)、Ni(II)、Cd(II)、Zn(II)、Cu(II)和Fe(III)的复合物形成,表明该配体表现为单质子配体。形成的复合物的稳定常数随着温度的升高而降低,反映出复合过程为放热过程。计算并分析了热力学参数,以研究金属与配体之间的键合特性。计算得出的DG、DH和DS值表明复合过程是自发的。计算的配体(HL)的离解常数依赖于配体的碱性与不同溶剂的介电常数之间的关系。