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Citation: Zhu Zhi-Ang, Huang Xiao-Qun, Chen Rong-Ti. Kinetic Study of the Electrophilic Substitution Reaction of Copper ion with Meso-tetrakis (Meta-methylphenyl) Porphyrin Cadmium (II)[J]. Acta Physico-Chimica Sinica, ;1993, 9(05): 635-641. doi: 10.3866/PKU.WHXB19930513 shu

Kinetic Study of the Electrophilic Substitution Reaction of Copper ion with Meso-tetrakis (Meta-methylphenyl) Porphyrin Cadmium (II)

1.
Department of Chemistry, Nankai University, Tianjin 300071

Received Date: 10 April 1992
Available Online: 15 October 1993

Kinetics of the electrophilic substitution reaction (1) of
CuCl_2+Cd(Ⅱ)P→Cu(Ⅱ)P+CdCl_2 (1)
cupric chloride with meso-tetrakis(meta-methylphenyl) porphyrin cadmium(Ⅱ) was studied by means of Shimadzu UV-240 spectrophotometer. The proposed mechanism is as follows:
Cd(Ⅱ)P+Cl~-<=>[Cd(Ⅱ)PCl]~- (2)
Cu(Ⅱ)+[Cd(Ⅱ)PCl]~-<=>[Cu(Ⅱ)PCl]~-+Cd(Ⅱ) (3)
[Cu(Ⅱ)PCl]~-→Cu(Ⅱ)P+Cl~- (4)
The experimental data were treated with AST-286 microcomputer. The equilibrim constant(K) of preequilibrium step(1) and the rate constants(k_1, k_(-1), k_2) of step (2) and step (3) were obtained. The standard molar enthalpy change △_rH_m~-θ-, and standard entropy change △_rS_m~-θ-, of step (1) and the activation parameters Δ~≠H_(m,1), Δ~≠H_(m,-1), Δ~≠H_(m,2) and Δ~≠S_(m,1), Δ~≠S_(m,-1), Δ~≠S_(m,2) were calculated.
- Tetrakis (Meta-methylphenyl) Porphyrin Cadmium (II); Kinetics of Substitution reaction; Mechanism of reaction
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