DIRECT KINETIC-STUDY OF RADICAL TRANSFORMATION REACTION ME2COH + PH2CO-]ME2CO + PH2COH

被引：30

作者：

DEMETER, A ^{[1
]}

BERCES, T ^{[1
]}

机构：

[1] HUNGARIAN ACAD SCI,CENT RES INST CHEM,POB 17,H-1525 BUDAPEST,HUNGARY

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1991年 / 95卷 / 03期

关键词：

D O I：

10.1021/j100156a036

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：

Reaction Me2COH + Ph2CO --> Me2CO + Ph2COH (5) was studied by laser flash photolysis under such experimental conditions where the changes in the concentrations of ketyl radicals with reaction time were controlled by this radical transformation process. Diphenylketyl radical concentration profiles were obtained by monitoring transient absorption at 540 nm and the rate coefficient k5 was extracted from that part of the concentration trajectory which was determined solely by reaction 5. Thus, k5 = (3.6 +/- 0.6) X 10(5) dm3 mol-1 s-1 was determined at 298 K in acetonitrile, which is higher than the two recently reported values derived from quantum yields measured under steady-state conditions. A reaction mechanism for the radical transformation process (5) is proposed in which hydrogen-bonded species formed from ketyl radical and benzophenone participate.

引用

页码：1228 / 1232

页数：5

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