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• W2884328310 abstract "The rate of displacement of the chloride ligands by three neutral nucleophiles (Nu) of different steric demands, namely thiourea (TU), N,N’-dimethylthiourea (DMTU) and N,N,N,’N-tetramethylthiourea (TMTU) in the complexes viz; [Pt(II)(bis(2-pyridylmethyl)amine)Cl]ClO 4 , ( Pt1 ), [Pt(II){N-(2-pyridinylmethyl)-8-quinolinamine}Cl]Cl, ( Pt2 ), [Pt(II)(bis(2-pyridylmethyl)sulfide)Cl]Cl, ( Pt3 ) and [Pt(II){8-((2-pyridylmethyl)thiol)quinoline}Cl]Cl, ( Pt4 ) was studied under pseudo first-order conditions as a function of concentration and temperature using a stopped-flow technique and UV-Visible spectrophotometry. The observed pseudo first-order rate constants for substitution reactions obeyed the simple rate law . The results have shown that the chloro ligand in Pt(N^S^N) complexes is more labile by two orders of magnitude than Pt(N^N^N) complexes due to the high trans labilizing effect brought by the S-donor atom . The quinoline based Pt(II) complexes ( Pt2 and Pt4 ) have been found to be slow than their pyridine counterparts Pt1 and Pt3 due to poor π-acceptor ability of quinoline. Second-order kinetics and large negative activation entropies support an associative mode of activation. Key words : Substitution, nucleophiles, pseudo first-order, associative, entropy" @default.
• W2884328310 created "2018-08-03" @default.
• W2884328310 creator A5086583281 @default.
• W2884328310 date "2018-06-26" @default.
• W2884328310 modified "2023-09-23" @default.
• W2884328310 title "A trans influence and π-conjugation effects on ligand substitution reactions of Pt(II) complexes with tridentate pendant N/S-donor ligands" @default.
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