Effect of pi-electron conjugation length on the solvent-dependent S(1) lifetime of peridinin.

Effect of pi-electron conjugation length on the solvent-dependent S(1) lifetime of peridinin.
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DOI:
10.1016/j.cplett.2008.08.056
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发表时间:
2008-09-22
影响因子:
2.8
通讯作者:
Frank, Harry A.
Frank, Harry A.
中科院分区:
化学4区
文献类型:
--
作者:
Chatterjee, Nirmalya;Niedzwiedzki, Dariusz M.;Kajikawa, Takayuki;Hasegawa, Shinji;Katsumura, Shigeo;Frank, Harry A.

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由于分子内电荷转移 (ICT) 态的存在,Peridinin 的 S1 激发态寿命表现出异常溶剂依赖性。这种状态的性质尚未阐明。对一种合成类似物 C35-peridinin 进行了超快时间分辨光谱分析,该类似物的共轭双键比 peridinin 少一个。数据显示,寿命从正己烷中的 1.5 ns 降低到甲醇中的 9.2 ps,比多甲素大一个数量级。这是迄今为止报道的对类胡萝卜素 S1 态寿命最强的溶剂依赖性。数据支持 S1 和 ICT 状态强耦合的观点。
Peridinin exhibits an anomalous solvent dependence of its S1 excited state lifetime attributed to the presence of an intramolecular charge transfer (ICT) state. The nature of this state has yet to be elucidated. Ultrafast time-resolved optical spectroscopy has been performed on a synthetic analog, C35-peridinin, having one less conjugated double bond than peridinin. The data reveal the lifetime decreases from 1.5 ns in n-hexane to 9.2 ps in methanol, an order of magnitude larger than peridinin. This is the strongest solvent dependence on the lifetime of an S1 state of a carotenoid yet reported. The data support the view that the S1 and ICT states are strongly coupled.
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影响因子: 3.3
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