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Citation: HU Zhen-Zhu, ZHU Zhi-Ang, CHEN Dong-Hong. Thermodynamics of Protonation Reaction of Porphyrinanthraquinone Compounds[J]. Chinese Journal of Applied Chemistry, ;2004, 21(8): 770-774. shu

Thermodynamics of Protonation Reaction of Porphyrinanthraquinone Compounds

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a Department of Chemistry and Environmental Engineering, Hubei Normal College, Huangshi 435002;
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b Department of Chemistry, Nankai University, Tianjin;
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c Tongji Medical School, Huazhong University of Science and Technology, Wuhan

Corresponding author: HU Zhen-Zhu,
Received Date: 29 August 2003
Available Online: 26 December 2003
Fund Project: 国家自然科学基金(20171024) (20171024)湖北省教育厅基金(2004D005)资助项目 (2004D005)

The overall protonation constants of five porphyrin-anthraquinone compounds were determined by spectrophotometric method. The changes of standard molar enthalpy △_rH^θ_m<0 and standard molar entropy △_rS_m^θ0 in the protonation reaction were calculated from the plots of lg K^θ vs 1/T. The in electron effect and steric hindrance of substituent groups on overall protonation constants were discussed.The net charge at=N-atom as well as the frontier orbital energy difference of porphyrin molecules were calculated by using semiempirical PM3 method. Experimental data showed that the protonation degree of porphyrins depends on the net charge at=N-atom as well as the frontier orbital energy difference of porphyrin and steric hindrance of substituent group.
- porphyrin-aminoanthraquinone compound,
- UV-Vis spectrometry,
- apparent protonation constant,
- parameterzed model revision 3
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