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Photoisomerization of Stilbene Dendrimers: The Need for a Volume‐conserving Isomerization Mechanism ¶
Author(s) -
Uda Mayuko,
Mizutani Takuo,
Hayakawa Junpei,
Momotake Atsuya,
Ikegami Masashi,
Nagahata Ritsuko,
Arai Tatsuo
Publication year - 2002
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 - 10.1562/0031-8655(2002)0760596posdtn2.0.co2
Subject(s) - photoisomerization , isomerization , dendrimer , photochemistry , excited state , chemistry , double bond , excimer , singlet state , fluorescence , polymer chemistry , organic chemistry , catalysis , optics , physics , nuclear physics
Highly branched stilbene dendrimers were synthesized and their photochemical behavior was studied. Even the stilbene dendrimer with molecular weight over 6500 underwent trans – cis isomerization in the excited singlet state within the lifetime of 10 ns. The photoisomerization of C=C double bond of stilbene dendrimers in the excited state may proceed by a volume‐conserving novel mechanism such as hula‐twist rather than conventional 180° rotation around the C=C double bond based on fluorescence and isomerization experiments.