Chem. J. Chinese Universities ›› 1992, Vol. 13 ›› Issue (4): 509.

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Studies on Structure and Porperties of Tetraphenylporphyrin and Its Derivatives (Ⅲ)——Standard Molar Enthalpies of Sublimation, and Formation, Enthalpies of Strain and Resonance Energy

LI Liang-chao1, LUO Ming-dao2, QU Song-sheng2, HUANG Su-qiu2, YAN Xiao-ci2   

  1. 1. Jingzhon Education College, Jingzhou, 434100;
    2. Department of Chemistry, Wuhan University, Wuhan, 430072
  • Received:1991-04-19 Online:1992-04-24 Published:1992-04-24

Abstract: Based upon the structural characteristics of tetraphenylporphyrin and its derivatives, we defined  Firstly, (这里有图片19920428-509-1.gif) and ΔS-R  Phy-X are determined, then the standard molar enthalpies of sublimation, the standard enthalpies of formation in gas phase are obtained.The enthalpies of strain, resonance energies and twisty angle of these compounds are also obtained by HMO method.The linear relationship between the gas phase standard enthalpies of formation and the substituent constants is discussed.

Key words: Strain effect, Resonance effect, Twisty angle, Resonance energy

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