THE ORIENTATION OF THE TRIPLET AXES WITH RESPECT TO THE OPTICAL-TRANSITION MOMENTS IN (BACTERIO)CHLOROPHYLLS

被引：25

作者：

VRIEZE, J ^{[1
]}

HOFF, AJ ^{[1
]}

机构：

[1] LEIDEN UNIV,HUYGENS LAB,DEPT BIOPHYS,2300 RA LEIDEN,NETHERLANDS

来源：

CHEMICAL PHYSICS LETTERS | 1995年 / 237卷 / 5-6期

关键词：

D O I：

10.1016/0009-2614(95)00354-7

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：

Chlorophyll a (Chl a), bacteriochlorophyll a (BChl a) and bacteriochlorophyll g (BChl g) were studied by absorbance-detected magnetic resonance (ADMR) and linear-dichroic (LD-) ADMR in zero magnetic field using two different glassy matrices. The microwave-induced triplet-minus-singlet absorbance-difference spectra were measured in the wavelength region 500-900 nm. With LD-ADMR the orientations of the near-infrared singlet-singlet and triplet-triplet transition moments relative to the in-plane triplet x and y axes were obtained. For all (B)Chls studied, the Q(Y)- and near-infrared triplet-triplet transition moments are mutually parallel (within 5 degrees), and oriented in the triplet xy plane. For BChl a and BChl g the Q(Y)-transition moment was found to be oriented within 20 degrees parallel to the triplet y axis. For Chl a the orientation of the Q(Y)-transition moment with respect to the triplet y axis was found to be 35-45 degrees, the precise value depending on the solvent used.

引用

页码：493 / 501

页数：9