Charge-transfer state as a possible signature of a zeaxanthin-chlorophyll dimer in the non-photochemical quenching process in green plants

被引：129

作者：

Dreuw, A ^{[1
]}

Fleming, GR

Head-Gordon, M

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Chem Sci & Phys Biosci, Berkeley, CA 94720 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2003年 / 107卷 / 27期

关键词：

DENSITY-FUNCTIONAL THEORY; EXCESS LIGHT ENERGY; XANTHOPHYLL CYCLE; PHOTOSYSTEM-II; S-1; STATE; FLUORESCENCE; LEAVES; APPROXIMATION; CHLOROPLASTS; CAROTENOIDS;

D O I：

10.1021/jp034562r

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Quantum chemical calculations of the electronic excited states of a zeaxanthin-chlorophyll dimer show that a zeaxanthin-to-chlorophyll charge-transfer (CT) state lies in the same energy regime as the excited states S-1 of zeaxanthin and Q(y) of chlorophyll, which are relevant for the nonphotochemical quenching (NPQ) process in green plants. Comparison with an analogous violaxanthin-chlorophyll dimer is made, and possible quenching mechanisms via excitation energy transfer or electron transfer are discussed. It is pointed out that the strongly allowed absorption of the zeaxanthin radical cation present in the CT state can be experimentally used as signature of the zea-chl dimer during the NPQ process.

引用

收藏

页码：6500 / 6503

页数：4

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