Ultrafast Time-resolved Absorption Spectroscopy of Geometric Isomers of Xanthophylls.
Ultrafast Time-resolved Absorption Spectroscopy of Geometric Isomers of Xanthophylls.
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DOI：
10.1016/j.chemphys.2010.01.019
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发表时间：
2010-07-19
期刊：
影响因子：
2.3
通讯作者：
Frank HA
中科院分区：
文献类型：
--
作者：
Niedzwiedzki DM;Enriquez MM;Lafountain AM;Frank HA
本文介绍了一个超快光谱研究的激发态能量，寿命和光谱的特定几何异构体的新黄质，紫黄质，叶黄素和玉米黄质。还检测了全反式和15，15 '-顺式-β-胡萝卜素。对通过HPLC纯化的分子进行光谱分析，立即冷冻以抑制异构化。在77 K下拍摄光谱以保持构型并提供比在室温下看到的更好的光谱分辨率。动力学结果表明，除了新黄质外，顺式异构体的S1态寿命均短于全反式异构体。通过记录S_1 → S_2瞬态吸收光谱，确定了所有异构体的S_1激发态能量。在低温下以这种方式获得的结果提供了一个前所未有的精度水平，在测量的S1能量的这些叶黄素，这是在捕光色素-蛋白质复合物的绿色植物的关键组成部分。
This paper presents an ultrafast optical spectroscopic investigation of the excited state energies, lifetimes and spectra of specific geometric isomers of neoxanthin, violaxanthin, lutein, and zeaxanthin. All-trans- and 15,15’-cis-β-carotene were also examined. The spectroscopy was done on molecules purified by HPLC frozen immediately to inhibit isomerization. The spectra were taken at 77 K to maintain the configurations and to provide better spectral resolution than seen at room temperature. The kinetics reveal that for all of the molecules except neoxanthin, the S1 state lifetime of the cis-isomers is shorter than that of the all-trans isomers. The S1 excited state energies of all the isomers were determined by recording S1 → S2 transient absorption spectra. The results obtained in this manner at cryogenic temperatures provide an unprecedented level of precision in the measurement of the S1 energies of these xanthophylls, which are critical components in light-harvesting pigment-protein complexes of green plants.
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DOI：
10.1073/pnas.92.6.2273
发表时间：
1995-03-14
影响因子：
11.1
作者：
GILMORE, AM;HAZLETT, TL;GOVINDJEE
通讯作者：
GOVINDJEE
影响因子：
2.9
作者：
Billsten, HH;Sundström, V;Polívka, T
通讯作者：
Polívka, T
DOI：
10.1021/jp711946w
发表时间：
2008-08-28
期刊：
The journal of physical chemistry. B
影响因子：
--
作者：
Cong H;Niedzwiedzki DM;Gibson GN;LaFountain AM;Kelsh RM;Gardiner AT;Cogdell RJ;Frank HA
通讯作者：
Frank HA
影响因子：
1.7
作者：
ENGLMAN, R;JORTNER, J
通讯作者：
JORTNER, J
影响因子：
3.7
作者：
FRANK, HA;CUA, A;WASIELEWSKI, MR
通讯作者：
WASIELEWSKI, MR