PHOTOPHYSICAL PROPERTIES OF METHYLATED PHENOLS IN NONPOLAR-SOLVENTS

被引：53

作者：

GRABNER, G ^{[1
]}

KOHLER, G ^{[1
]}

MARCONI, G ^{[1
]}

MONTI, S ^{[1
]}

VENUTI, E ^{[1
]}

机构：

[1] CNR,IST FRAE,I-40126 BOLOGNA,ITALY

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1990年 / 94卷 / 09期

关键词：

D O I：

10.1021/j100372a045

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：

The photophysical properties of phenol and a series of mono-, di-, and trimethyl-substituted phenols excited in their first singlet state in hydrocarbon solvents have been investigated by measuring fluorescence lifetimes and quantum yields and lowest triplet and phenoxyl radical formation quantum yields. The compounds studied have small quantum yields for fluorescence (φF = 0.02-0.075) and higher ones for triplet formation (φT = 0.05-0.35) and O-H bond photpdissociation (φR = 0.08-0.21), but in all cases the sum φF + φT + φR is smaller than 0.5. The nature of the radiationless deactivation processes involving the lowest singlet and triplet states, and the influence of ring methylation upon them, are discussed in light of the results. The importance of a triplet pathway in the photodissociation is confirmed. © 1990 American Chemical Society.

引用

页码：3609 / 3613

页数：5

共 31 条

[1] DETERMINATION OF TRIPLET QUANTUM YIELDS BY LASER FLASH ABSORPTION SPECTROSCOPY [J].