Premium
ON THE REACTION OF SINGLET MOLECULAR OXYGEN WITH N‐ALLYLTHIOUREA IN AQUEOUS SOLUTION
Author(s) -
Kraljic I.,
Kramer H. E. A.
Publication year - 1978
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.1751-1097.1978.tb07557.x
Subject(s) - singlet oxygen , thiourea , moiety , aqueous solution , chemistry , metastability , photochemistry , reaction rate constant , singlet state , oxygen , kinetics , inorganic chemistry , excited state , stereochemistry , organic chemistry , physics , quantum mechanics , nuclear physics
— Experiments on the photooxidation of N ‐allylthiourea, thiourea, and N‐allylurea sensitized by the dye phenosafranine show that in N ‐allylthiourea the thiourea group is the site of singlet oxygen attack, while the allyl moiety neither reacts with nor quenches this metastable form of O 2 (in neutral aqueous solutions). Low concentrations of N ‐ 3 (a known quencher of singlet oxygen) strongly reduce the photooxidation of allylthiourea by a mechanism which apparently obeys simple competition kinetics. From these results the rate constant of the reaction between allylthiourea and singlet oxygen is obtained ( k = 4 × 10 6 M ‐1 s ‐1 ; pH = 7.1).