Document Detail


Photoexcited Singlet and Triplet States of a UV Absorber Ethylhexyl Methoxycrylene.
MedLine Citation:
PMID:  23136952     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The excited states of UV absorber, ethylhexyl methoxycrylene (EHMCR) have been studied through measurements of UV absorption, fluorescence, phosphorescence and electron paramagnetic resonance spectra in ethanol. The energy levels of the lowest excited singlet (S(1) ) and triplet (T(1) ) states of EHMCR were determined. The energy levels of the S(1) and T(1) states of EHMCR are much lower than those of photolabile 4-tert-butyl-4'-methoxydibenzoylmethane. The energy levels of the S(1) and T(1) states of EHMCR are lower than those of octyl methoxycinnamate. The weak phosphorescence and EPR B(min) signals were observed and the lifetime was estimated to be 93 ms. These facts suggest that the significant proportion of the S(1) molecules undergoes intersystem crossing to the T(1) state and the deactivation process from the T(1) state is predominantly radiationless. The photostability of EHMCR arises from the (3) ππ* character in the T(1) state. The zero-field splitting parameter in the T(1) state is D*(*) = 0.113 cm(-1) . © 2012 Wiley Periodicals, Inc. Photochemistry and Photobiology © 2012 The American Society of Photobiology.
Authors:
Azusa Kikuchi; Yuki Hata; Ryo Kumasaka; Yuichi Nanbu; Mikio Yagi
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-9
Journal Detail:
Title:  Photochemistry and photobiology     Volume:  -     ISSN:  1751-1097     ISO Abbreviation:  Photochem. Photobiol.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376425     Medline TA:  Photochem Photobiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 Wiley Periodicals, Inc. Photochemistry and Photobiology © 2012 The American Society of Photobiology.
Affiliation:
Department of Chemistry, Graduate School of Engineering, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan.
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