FRACTION OF EXCITED-STATE OXYGEN FORMED AS B(1)SIGMA(+)(G) IN SOLUTION-PHASE-PHOTOSENSITIZED REACTIONS .2. EFFECTS OF SENSITIZER SUBSTITUENT

被引：16

作者：

WANG, B ^{[1
]}

OGILBY, PR ^{[1
]}

机构：

[1] UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131

来源：

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY | 1995年 / 90卷 / 2-3期

关键词：

SOLUTION-PHASE SINGLET SIGMA OXYGEN; ENERGY TRANSFER; TRIPLET STATE ORBITAL CONFIGURATION;

D O I：

10.1016/1010-6030(95)04076-R

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 fraction F(S)igma of excited-state oxygen formed as b (1) Sigma(g)(+) was determined for a series of triplet-state photosensitizers in CCl4 solutions. F-Sigma was determined by monitoring the intensities of (a) O-2(b (1) Sigma(g)(+)) fluorescence at 1926 nm (O-2(b (1) Sigma(g)(+)) --> O-2(a (1) Delta(g))) and (b) O-2(a (1) Delta(g)) phosphorescence at 1270 nm (O-2(a (1) Delta(g)) --> O-2(X(3) Sigma(g)(-))). Oxygen excited states were formed by energy transfer from substituted benzophenones and acetophenones. The data indicate that F(S)igma depends on several variables including the orbital configuration of the lowest tripler state and the tripler-state energy. The available data indicate that the sensitizer-oxygen charge transfer (CT) state is not likely to influence F-Sigma strongly by CT-mediated mixing of various sensitizer-oxygen states.

引用

页码：85 / 89

页数：5

共 40 条

[1] MECHANISTIC APPROACH TO THE SENSITIZATION PROCESS OF AROMATIC KETONES IN THE ISOMERIZATION BETWEEN NORBORNADIENE AND QUADRICYCLANE [J].