Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1254546 | Chinese Chemical Letters | 2012 | 5 Pages |
Abstract
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 3Â 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 ÎHÂ =Â 1.622Â kJÂ molâ1, ÎSÂ =Â 9.389Â JÂ molâ1Â Kâ1, and ÎGÂ =Â â1.585Â kJÂ molâ1 at TÂ =Â 298.15Â K.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Chemistry (General)
Authors
Li Hua Liu, Wen Bin Li, Fei Gao, Tian Rui Huo,