Low-lying electronic states of carotenoids.
Low-lying electronic states of carotenoids.
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类胡萝卜素的低位电子态。
DOI：
10.1016/0005-2728(92)90070-i
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
Frank,HA
中科院分区：
文献类型：
--
作者：
DeCoster,B;Christensen,RL;Gebhard,R;Lugtenburg,J;Farhoosh,R;Frank,HA
用高效液相色谱分离纯化了4种全反式胡萝卜素：球形烯、3，4，5，6-四氢球形烯、3，4，5，6-四氢球形烯和3，4，7，8-四氢球形烯，并用室温溶液的吸收光谱、荧光激发光谱进行了分析。这一系列分子的π-电子共轭程度从10个碳-碳双键减少到7个碳-碳双键，随着链长的减小，表现出从S2→S0(11Ba→11Ag)到S1→S0(21Ag→11Ag)的系统交叉发射。对S1→S0跃迁能的外推表明，较长类胡萝卜素的21Ag态的能量比之前认为的要低得多。在光合作用系统的天线复合体中，球菌素和其他长类胡萝卜素的S_1态能量与它们的叶绿素配对的S_1态能量相关。讨论了光合作用天线中能量传递的意义。
Four all-transcarotenouds, spheroidene, 3,4-dihydrospheroidene, 3,4,5,6-tetrahydrospheroidene, and 3,4,7,8-tetrahydrospheroidene, have been purified using HPLC techniques and analyzed using absorption, fluorescence excitation spectroscopy of room temperature solutions. This series of molecules, for which the extent of π-electron conjugation decreases from 10 to seven carbon-carbon double bonds, exhibits a systematic crossover from S2→S0(11Ba→ 11Ag) to S1→S0(21Ag→ 11Ag) emission with decreasing chain length. Extrapolation of the S1→S0transition energies indicates that the 21Agstates of longer carotenoids have considerably lower energies than previously thought. The energies of the S1states of spheroidenes and other long carotenoids are correlated with the S1energies of their chlorophyll partners in antenna complexes of photosynthetic systems. Implications for energy transfer in photosynthetic antenna are discussed.