Photoisomerization of Stilbene Dendrimers: The Need for a Volume-conserving Isomerization Mechanism¶

Mayuko Uda; Takuo Mizutani; Junpei Hayakawa; Atsuya Momotake; Masashi Ikegami; Ritsuko Nagahata; Tatsuo Arai

doi:10.1562/0031-8655(2002)076<0596:POSDTN>2.0.CO;2

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1 December 2002 Photoisomerization of Stilbene Dendrimers: The Need for a Volume-conserving Isomerization Mechanism

Mayuko Uda, Takuo Mizutani, Junpei Hayakawa, Atsuya Momotake, Masashi Ikegami, Ritsuko Nagahata, Tatsuo Arai

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Photochemistry and Photobiology, 76(6):596-605 (2002). https://doi.org/10.1562/0031-8655(2002)076<0596:POSDTN>2.0.CO;2

Abstract

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.

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Mayuko Uda, Takuo Mizutani, Junpei Hayakawa, Atsuya Momotake, Masashi Ikegami, Ritsuko Nagahata, and Tatsuo Arai "Photoisomerization of Stilbene Dendrimers: The Need for a Volume-conserving Isomerization Mechanism," Photochemistry and Photobiology 76(6), 596-605, (1 December 2002). https://doi.org/10.1562/0031-8655(2002)076<0596:POSDTN>2.0.CO;2

Received: 10 June 2002; Accepted: 1 September 2002; Published: 1 December 2002

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