Citation: Li Hua Liu, Wen Bin Li, Fei Gao, Tian Rui Huo. Adduct of magnesium tetraphenylporphyrin with aniline for colorimetric detection of SO₂[J]. Chinese Chemical Letters, ;2012, 23(2): 208-212. doi: 10.1016/j.cclet.2011.10.018 shu

Adduct of magnesium tetraphenylporphyrin with aniline for colorimetric detection of SO₂

College of Chemical Engineering, Inner Mongolia University of Technology, Huhhot 010051, China

Received Date: 21 July 2011

Fund Project: This work was supported by foundation of Inner Mongolia Autonomous Region's Educational Commission (No. NJZZ11068) and the School Scientific Research Fund (No. ZD201004, Inner Mongolia University of Technology, China).

Adduct of magnesium tetraphenyl porphyrin (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 ΔH=1.622 kJ mol^-1, ΔS=9.389 J mol^-1 K^-1, and ΔG=-1.585 kJ mol^-1 at T=298.15 K.
- Magnesium tetraphenyl porphyrin (MgTPP),
- Aniline,
- Spectroscopy,
- Thermodynamic
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