Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (06): 568-572.doi: 10.3866/PKU.WHXB19960619

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Thermodynamic Study of Coordination Reaction of Zinc Tetraphenylporphyrins with Substituted Lmidazoles

Chen Hong-Wei,Zhu Zhi-Ang,Ruan Wen-Juan,Zhang Zhi-Hui,Chen Zheng-Hua,Chen Rong-Ti   

  1. Department of Chemsitry,Nankai University,Tianjin 300071
  • Received:1995-10-18 Revised:1996-01-02 Published:1996-06-15
  • Contact: Zhu Zhi-Ang

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Abstract:

Equilibrium constants for reactions of ZnT(p-X)PP(para-substituted zinc tetraphenylporphyrins) with ligands of the substituted imidazole in CH2Cl2 and several other solvents have been determined by visible spectral techniques, and Rose-Drago method. Electronic effects in metalloporphrins and effects of ligands, temperature and solvents were investigated. It was found that equilibrium constants for reactions of ZnT(p-X)PP with ligands follow Hammett equation. The changes of standard molar enthalpy△rHm and the changes of standard molar entropy △rSm of the reactions were obtainedfrom the plots of lnK vs. 1/T.

Key words: Para-substituted zinc tetraphenylporphyrin, Substituted imidazole, UV-visible spectrum, Equilibrium constants, Coordination reaction