PORPHYRIN COMPOUNDS COMPRISING ONE OR MORE PYRIDONE MOIETIES
申请人:CONNORS ROBERT E.
公开号:US20120115901A1
公开(公告)日:2012-05-10
Various porphyrin compounds comprising one or more pyridone moieties, intermediates thereof, compositions thereof, and, methods of making and using thereof.
A porphyrin molecule that generates, traps, stores, and releases singlet oxygen
作者:Chuchawin Changtong、Daniel W. Carney、Lan Luo、Christopher A. Zoto、John L. Lombardi、Robert E. Connors
DOI:10.1016/j.jphotochem.2013.03.003
日期:2013.5
Tetraphenylporphyrin (H2TPP), covalently linked to four 2-pyridone moieties was synthesized (II) and studied. This composite molecule, in combination with light and ground state oxygen, has the ability to generate, trap, store, and release singlet oxygen. The process can be operated reversibly without detectable decomposition or side reactions using light with wavelength greater than 500 nm. Oxidation of the target molecule, 2-chloroethyl ethyl sulfide (CEES), by singlet oxygen released from the endoperoxide of the porphyrin-2-pyridone molecule (I) is demonstrated. Spectroscopic and kinetic data do not reveal evidence of perturbation between the porphyrin and pyridone ring systems of II. The decomposition kinetics for the endoperoxide adduct I are first order with activation parameters Delta H double dagger = 26.7 (kcal/mol) and Delta G double dagger = 24.0 (kcal/mol). Experimental and computational studies of unattached N-benzyl-2-pyridone peroxide are reported and compared to the experimental data for I. (C) 2013 Elsevier B.V. All rights reserved.