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LIFETIME AND ACTIVATION ENERGY OF THE PHOTOINDUCED QUINOID INTERMEDIATE IN PYRIDOXAL CATALYSIS
Author(s) -
Ledbetter John W.,
Hanckel John M.,
Cornish Timothy J.
Publication year - 1981
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.1751-1097.1981.tb08971.x
Subject(s) - activation energy , transamination , arrhenius equation , catalysis , proton , chemistry , photochemistry , metal , pyridoxal , amino acid , organic chemistry , physics , enzyme , biochemistry , quantum mechanics
— The lifetime of the p ‐quinoid intermediate of transamination was determined through photoinduction in the metal‐ion model system. From the dependence of the lifetime on temperature, the Arrhenius activation energy for proton transfer was 4.2–8.4 kJ/mol (1‐2 kcal/mol). The activation energy correlated well with the R group of the amino acid and demonstrated that native substrates have a very labile proton.