Synthesis and Characterization of 2-Pyridinylmethylene-2-quinolyl Hydrazone Cobalt(III) Complexes. Reactivity Trends and Solvent Effect on the Initial and Transition States of Base Catalyzed Hydrolysis
作者:Ahmad Desoky M. Mohamad
DOI:10.1007/s10953-017-0663-2
日期:2017.8
the Co(III) complexes in aqueous methanol mixtures at 25 °C. The reactivity trends in the transfer chemical potentials are discussed in terms of the nature of the bonded ligands. Kinetics of the base hydrolysis of Co(III)–hydrazone complexes in the aqueous methanol mixtures have been studied at 25 °C, and follow the rate law kobs = k2[OH−]. The solvent effects on the reactivity trends of Co(III) complexes
吡啶-2-醛-2-喹啉腙Co(III)硝酸盐[Co(paqh)2](NO3)2、甲基-2-吡啶基酮-2-喹啉腙Co(III)硝酸盐[Co(mpkqh)2]的配合物(NO3)2 和苯基-2-吡啶基酮-2-quinolinhyrazone Co(III) 硝酸盐 [Co(ppkqh)2](NO3)2 被制备和表征。测量了 Co(III)-腙络合物的溶解度。转移化学势是根据 Co(III) 配合物在 25°C 下甲醇水溶液混合物中的溶解度计算得出的。根据键合配体的性质讨论了转移化学势的反应性趋势。Co(III)-腙络合物在甲醇水溶液混合物中的碱水解动力学在 25 °C 下进行了研究,并遵循速率定律 kobs = k2[OH-]。溶剂对 Co(III) 配合物反应趋势的影响分析为初始状态 (is) 和过渡态 (ts) 组分。随着甲醇含量的增加,反应速率降低。与含水甲醇混合物中的初始状态相比,过渡状态的不稳定是显着的。初始状态本质上比