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A MORE EXACT THEORETICAL INTERPRETATION OF RECENT EXPERIMENTAL DATA OBTAINED USING THE SEPARATED SENSITIZER AND SUBSTRATE METHOD TO INVESTIGATE O 2 (lδ g ) INTERACTIONS. POSSIBLE IMPORTANCE OF O 2 (1σ g +)
Author(s) -
Parker J. G.
Publication year - 1988
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1988.tb02812.x
Subject(s) - oxidizing agent , chemistry , singlet oxygen , substrate (aquarium) , pooling , interpretation (philosophy) , aqueous solution , singlet state , computational chemistry , oxygen , excited state , atomic physics , physics , organic chemistry , oceanography , artificial intelligence , computer science , programming language , geology
— Recent experimental data obtained using the separated sensitizer and substrate method to investigate the interaction of O 2 ( 1 δ g ) with various substances has been re‐interpreted by means of a more complete theory. Comparison of experimental and recalculated values of the dependence of relative reaction rates on the sensitizer‐substrate separation indicate general accord for experiments in which singlet oxygen acceptors in aqueous solution were used. The presumption is therefore that singlet molecular oxygen O 2 ( 1 δ g ) is indeed the active oxidizing agent and that the theory presented and experiment are entirely in agreement. For experiments in which bacterial targets were used a very distinct disagreement between theory and experiment is evident, the conclusion being that the kill rate does not depend linearly on the O 2 ( 1 δ g ) concentration in the immediate proximity of the bacteria. However, the data is consistent with a quadratic dependence on the 1 δ g concentration. A possible conclusion therefore is that the cytotoxic species is actually O 2 ( 1 σ + g ), formed by an energy pooling reaction involving two O 2 ( 1 δ g ) molecules.