Adduct of magnesium tetraphenylporphyrin with aniline for colorimetric detection of SO2

作者：Liu, Li Hua^*; Li, Wen Bin; Gao, Fei; Huo, Tian Rui

来源：Chinese Chemical Letters, 2012, 23(2): 208-212.

DOI：10.1016/j.cclet.2011.10.018

• Magnesium tetraphenylporphyrin (MgTPP)
• Aniline
• Spectroscopy
• Thermodynamic

Adduct of magnesium tetraphenylporphyrin (MgTPP) with aniline for colorimetric detection of SO2 was investigated in CH2Cl2 by steady-state fluorescence and UV-vis absorption spectroscopic techniques. The UV-vis spectra showed that the increasing aniline concentrations resulted in red shift of 3 nm for MgTPP Soret absorption band. Once introduced, SO2 competes with MgTPP for aniline, which eventually leads to the release of MgTPP and changes in the solution color/absorption. The fluorescence spectra suggested that MgTPP interacted with aniline to form 1:1 molecular adducts, and showed that the binding of MgTPP with aniline with the binding constants of 1.58-1.64 is not only endothermal but entropy-driven with Delta H = 1.622 kJ mol(-1), Delta S = 9.389 J mol(-1) K-1, and Delta G = 1.585 kJ mol(-1) at T = 298.15 K.

• 出版日期2012-2
• 单位内蒙古工业大学