Chirality inversion in a molecular exciton

被引：30

作者：

Boiadjiev, SE ^{[1
]}

Lightner, DA ^{[1
]}

机构：

[1] Univ Nevada, Dept Chem, Reno, NV 89557 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2000年 / 122卷 / 02期

关键词：

D O I：

10.1021/ja993242b

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The bichromophoric pigment bilirubin acts as a molecular exciton in its UV-visible and circular dichroism (CD) spectroscopy. The optically active analogue, (beta R,beta'R)-dimethyllmesobilirubin-XIII alpha exhibits intense bisignate CD Cotton effects in the region of its long wavelength UV-vis absorption near 400 nm, with Delta epsilon(434)(max) +337, Delta epsilon(389)(max) -186 in the nonpolar solvent CHCl3, and nearly as intense Cotton effects in the polar, hydrogen bonding solvent CH3OH: Delta epsilon(431)(max) +285, Delta epsilon(386)(max) -177. Addition of amines to Cotton effect sign inversions: in isopropylamine Delta epsilon(436)(max) -605, Delta epsilon(392)(max) +375, due to an inversion of molecular chirality.

引用

页码：378 / 383

页数：6

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