Electron transfer of carotenoids imbedded in MCM-41 and Ti-MCM-41: EPR, ENDOR, and UV-Vis studies

被引：34

作者：

Gao, YL ^{[1
]}

Konovalova, TA ^{[1
]}

Xu, T ^{[1
]}

Kispert, LA ^{[1
]}

机构：

[1] Univ Alabama, Dept Chem, Tuscaloosa, AL 35487 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2002年 / 106卷 / 42期

关键词：

D O I：

10.1021/jp025978s

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：

Electron transfer (ET) reactions of carotenoids (Car), beta-carotene (I), canthaxanthin (II), and 7'-apo-7',7'-dicyano-beta-carotene (III) imbedded in MCM-41 and Ti-MCM-41 were studied as a function of oxidation potential. The ET efficiency in MCM-41 was highest for the carotenoid with the lowest oxidation potential. The presence of Ti4+ in the framework of MCM-41 enhanced the ET efficiency of all carotenoids, but the enhancement did not depend on oxidation potential. The enhancement depends on whether complexes are formed between carotenoids and Ti4+. Complexes were formed with I and III but not with II. The presence of Ti4+ results in a large blue shift of the maximum absorption wavelength due to changes in the carotenoid conformation.

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页码：10808 / 10815

页数：8

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