Uda Mayuko, Mizutani Takuo, Hayakawa Junpel, Momotake Atsuya, Ikegami Masashi, Nagahata Ritsuko, Arai Tatsuo
Department of Chemistry, University of Tsukuba, Tsukuba, Ibaraki, Japan.
Photochem Photobiol. 2002 Dec;76(6):596-605. doi: 10.1562/0031-8655(2002)076<0596:posdtn>2.0.co;2.
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 degrees rotation around the C=C double bond based on fluorescence and isomerization experiments.
合成了高度支化的芪类树枝状大分子，并研究了它们的光化学行为。即使是分子量超过6500的芪类树枝状大分子，在激发单重态下也能在10纳秒的寿命内发生反式-顺式异构化。基于荧光和异构化实验，芪类树枝状大分子中C=C双键在激发态下的光异构化可能通过一种体积守恒的新机制进行，如呼啦圈扭转，而不是围绕C=C双键进行传统的180度旋转。
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