Kinetic Study of Axial Coordination of Para-Substituted (Tetraphenylporphinato) Iron(Ⅲ) Chloride

Abstract

Abstract: Akinetic study is reported for the axial coordination of imidazole(Im).with para-substituted (tetraphenylporphinato)-iron(Ⅲ) chloride [Fe(p-X)TPPCl; X=Cl, H, CH₃, OCH₃] in acetone by means of Union Giken RA-401 stopped-folw spectrophotometer.The mechanism is postulated as follows:(这里有图片19891013-1030-1.gif)The experimental data were treated with CA-033Emicro computer.The equilibrium constant (K) of the preequilibrium step(l) and the rate constant(k) of the rate determining step(2) were obtained.The standard enthalpy △H^?and standard entropy △S^?of step (1), and the activation parameters △Hand △S^≠of step (2) were calculated.It was found that linear relationships exists between the following pairs : △H^?and the Hammett constant δ; △S^?and δ ; △H^≠and δ ; △S^≠and δ; lnKand δ; lnk and δ.The isokinetic relationship between △H^≠and △S^≠was also found.

Key words: Para-substituted (Tetraphenylporphinato) iron (Ⅲ) chloride, Imidazole, Stopped-flow method, Reaction mechanism, Isokinetic relationship

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Zhu Zhi'ang, Ma Yuxin, Chen Rongti . Kinetic Study of Axial Coordination of Para-Substituted (Tetraphenylporphinato) Iron(Ⅲ) Chloride[J]. Chem. J. Chinese Universities, 1989, 10(10): 1030.

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Kinetic Study of Axial Coordination of Para-Substituted (Tetraphenylporphinato) Iron(Ⅲ) Chloride

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