Ultrafast excited state dynamics of spirilloxanthin in solution and bound to core antenna complexes: Identification of the S* and T1 states
Ultrafast excited state dynamics of spirilloxanthin in solution and bound to core antenna complexes: Identification of the S* and T1 states
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DOI：
10.1063/1.4737129
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发表时间：
2012-08-14
影响因子：
4.4
通讯作者：
Hashimoto, Hideki
中科院分区：
文献类型：
--
作者：
Kosumi, Daisuke;Maruta, Satoshi;Hashimoto, Hideki
利用飞秒泵浦-探测光谱技术研究了红杜鹃（Rhodocellum rubrum Si）捕光核心天线复合物与红杜鹃黄素（Rhodocellum rubrum Si）溶液的超快激发态动力学。先前提出的S* 状态的大豆黄素，清楚地观察到在溶液中，并绑定到光捕获核心天线复合物，而最低的三重激发态出现只有大豆黄素绑定到蛋白质复合物。超快形成的三重结合的蛋白质复合物，观察到无论是藻黄素或细菌叶绿素-a的激发。根据藻黄素与细菌叶绿素a之间的超快能量转移，讨论了超快三重态形成的异常反应。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4737129]
Ultrafast excited state dynamics of spirilloxanthin in solution and bound to the light-harvesting core antenna complexes from Rhodospirillum rubrum Si were investigated by means of femtosecond pump-probe spectroscopic measurements. The previously proposed S* state of spirilloxanthin was clearly observed both in solution and bound to the light-harvesting core antenna complexes, while the lowest triplet excited state appeared only with spirilloxanthin bound to the protein complexes. Ultrafast formation of triplet spirilloxanthin bound to the protein complexes was observed upon excitation of either spirilloxanthin or bacteriochlorophyll-a. The anomalous reaction of the ultrafast triplet formation is discussed in terms of ultrafast energy transfer between spirilloxanthin and bacteriochlorophyll-a. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4737129]