SPECTRAL, LIFETIME AND PHOTOCHEMICAL CHARACTERISTICS OF 4-ACETOXY-CHALCONE IN VISCOUS MEDIA

被引：4

作者：

ELDALY, SA ^{[1
]}

EBIED, EZM ^{[1
]}

DUPORTAIL, G ^{[1
]}

机构：

[1] UNIV LOUIS PASTEUR,CTR RECH PHARMACEUT,BIOPHYS LAB,CNRS,URA 491,F-67401 ILLKIRCH GRAFFENS,FRANCE

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 1994年 / 50卷 / 07期

关键词：

D O I：

10.1016/0584-8539(94)80087-1

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Both fluorescence and excitation spectra of 4-acetoxy-chalcone (4-AC) are bathochromically shifted as the medium polarity increases. The fluorescence quantum yields are sensitive to medium viscosity and increase sharply as the medium viscosity increases due to prohibition of radiationless deactivation pathways. The fluorescence lifetime of 4-AC in glycerol has been measured as tau = 1.9 ns. The photochemical quantum yields (thought to be a trans-cis photo-isomerization) are also sensitive to medium viscosity with minimum phi(c) values obtained in highly viscous solvents. The effect of medium viscosity on the quenching of 4-AC fluorescence using picric acid as a quencher has been studied. A static-type quenching mechanism is proposed to account for the quenching efficiency as the medium viscosity increases.

引用

页码：1227 / 1233

页数：7

共 20 条

[1]

BARLTROP JA, 1975, EXCITED STATES ORGAN, P152

[2] QUANTUM COUNTING BY LASER-DYES IN A BROAD SPECTRAL RANGE INCLUDING THE NEAR-INFRARED REGION [J].