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Direct Spectroscopic Evidence for 1Δ g O 2 Production from the Photolysis of Vanadium(V)‐Peroxo Complexes in Aqueous Solution
Author(s) -
Chou PiTai,
Lee MingZen,
Wel ChinYen,
Wu GuoRay,
Shek Lai Kuen,
Kwong Daniel W. J.
Publication year - 1999
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.1751-1097.1999.tb08278.x
Subject(s) - photodissociation , vanadium , aqueous solution , chemistry , quantum yield , chemiluminescence , relaxation (psychology) , photochemistry , inorganic chemistry , fluorescence , physics , social psychology , psychology , quantum mechanics
The chemiluminescence of 1 DL g O 2 expelled from the UV photolysis of vanadium(V)‐peroxo (VP) complexes in aqueous solution was observed for the first time. Using phenalenone photosensitization as a standard reference, the 1 O 2 quantum yields from the photolysis of 12 VP complexes were measured. No good correlation was found between the relative DNA‐photocleavage activities and the 1 O 2 quantum yields of these complexes. This lack of correlation underscores the significant contribution of the complex‐DNA binding interaction in determining the observed DNA‐photocleavage activity of the complex. The small 1 O 2 quantum yields observed in these complexes were interpreted in terms of the minor 1 O 2 pho‐toelimination channel relative to other more efficient relaxation processes.