Spectral properties of bacteriochlorophyll c in nematic liquid crystal .1. Monomeric forms of dye

被引：23

作者：

Dudkowiak, A ^{[1
]}

Francke, C ^{[1
]}

Amesz, J ^{[1
]}

Planner, A ^{[1
]}

Hanyz, I ^{[1
]}

Frackowiak, D ^{[1
]}

机构：

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

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 1996年 / 52卷 / 02期

关键词：

bacteriochlorophyll c; bacteriopheophytin c; delayed luminescence; liquid crystal; polarized spectroscopy;

D O I：

10.1016/0584-8539(95)01577-9

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

The spectroscopic features of bacteriochlorophyll c and bacteriopheophytin c in a nematic liquid crystal matrix have been investigated. Absorption, circular dichroism, fluorescence and time resolved delayed luminescence spectra have been measured. The pigment is introduced to the liquid crystal from a dry and from a hydrated chloroform solution. In both cases the pigment is in the monomeric form. Hydration of the solvent and the presence or absence of the central Mg atom affect the interaction of the pigment molecules with the liquid crystal matrix, changing the fluorescence anisotropy. A model for the bacteriochlorophyll c orientation in the liquid crystal is proposed and the averaged angles between the transition moments and the liquid crystal orientation axis are determined. A slow process (in the microsecond range) of radiative deactivation of energy absorbed by the pigments is observed. This delayed emission could be due to pigment ionization and delayed charge recombination and/or thermal activation from the triplet to the excited singlet state.

引用

页码：251 / 264

页数：14

共 41 条

[1]

ARCIONI A, 1988, POLARIZED SPECTROSCO, P421

[2] DICHROISM AND POLARIZED FLUORESCENCE OF CHLOROPHYLL-A, CHLOROPHYLL-C AND BACTERIOCHLOROPHYLL-A DISSOLVED IN LIQUID-CRYSTALS [J].