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A new single pulse method for the measurements of photosensitized singlet oxygen quantum yield

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Title A new single pulse method for the measurements of photosensitized singlet oxygen quantum yield
 
Creator VENKATESAN, R
TAMIJSELVY, S
PERIASAMY, N
RAJENDIRAN, TM
RAO, PS
SRIVASTAVA, TS
 
Subject molecular-oxygen
 
Description A new simpler relative method for estimating photosensitized singlet oxygen quantum yield has been developed. In this method a strong depletion signal is observed when porphyrin (2 muM) and 1,3-diphenylisobenzofuran (DPBF, 500 muM) are irradiated using second harmonic 532 nm Nd-YAG laser pulse and monitored at 410 or 415 nm by a ultraviolet filtered white light. The observed depletion is attributed to the reaction of DPBF with sensitized singlet oxygen. The amplitude of the depletion signal is related directly to the singlet oxygen sensitization yield. Appropriate kinetic equations have been derived to relate the change in the absorbance of DPBF and singlet oxygen quantum yield. The singlet oxygen quantum yields of fifteen porphyrins and metalloporphyrins have been investigated in dimethylformamide solution. The results a-re compared with the quantum yields obtained by the usual kinetic run experiments. The results are found to match exceedingly well in the two methods.
 
Publisher NATL INST SCIENCE COMMUNICATION
 
Date 2011-08-19T03:15:45Z
2011-12-26T12:56:01Z
2011-12-27T05:44:04Z
2011-08-19T03:15:45Z
2011-12-26T12:56:01Z
2011-12-27T05:44:04Z
2002
 
Type Article
 
Identifier INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL & ANALYTICAL CHEMISTRY, 41(2), 346-349
0376-4710
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10206
http://hdl.handle.net/10054/10206
 
Language en