Adduct of magnesium tetraphenylporphyrin with aniline for colorimetric detection of SO2
摘要:
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. (C) 2011 Li Hua Liu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Supramolecular binding of amines with functional magnesium tetraphenylporphyrin for CO2 capture
摘要:
In this work, magnesium tetraphenylporphyrin (MgTPP) was used as a new supramolecular amine-fixing agent. Once introduced, CO2 easily competes with MgTPP for amines, leading to the release of MgTPP. The processes can be explained by the fact that the association constant (K-assoc) values of MgTPP with amines were in the range of 0.6 (ethanolamine) to 3.9 (ethylenediamine), which are lower than the K-assoc values of CO2 with these amines. MgTPP interacted with aniline, ethanolamine, pyrrolidine, or ethylenediamine to form 1:1 adducts. Ethylenediamine presents a stronger K-assoc value for MgTPP, so it was considered an optimal agent for CO2 capture. (c) 2013 Jian-Bin Zhang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.