Singlet molecular oxygen-mediated photooxidation of nitrophenolic compounds in water-in-oil microemulsions. A kinetic study

被引:19
作者
Borsarelli, CD [1 ]
Durantini, EN [1 ]
Garcia, NA [1 ]
机构
[1] UNIV NACL RIO CUARTO,DEPT QUIM FIS,RA-5800 RIO CUARTO,ARGENTINA
来源
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2 | 1996年 / 09期
关键词
D O I
10.1039/p29960002009
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
The aerobic singlet molecular oxygen-mediated photooxidation of 2-nitrophenol (2NP) and 4-methyl-2-nitrophenol (4M2NP) has been studied in water-in-oil (WIG) microemulsion media, The microemulsions used were sodium bis(2-ethylhexyl)sulfosuccinate (AOT)-heptane-water or benzylhexadecyldimethylammonium chloride (BHDC)-benzene-water. The kinetic profile of the reaction was investigated as a function of variables such as (a) surfactant structure and concentration and (b) amount of water dispersed in the microemulsion. Rate constants for overall quenching (k(t)) and chemical reaction (k(r)) for the interaction of 2NP and 4M2NP with singlet molecular oxygen in the microemulsion media were determined. The quantum efficiencies for the nitro-derivatives' photooxidation (phi(r)) in both anionic and cationic W/O microemulsions are one to two orders of magnitude-larger than in aqueous solutions. A mechanism based on polarity effects and probe location in the microemulsions is proposed in order to rationalize the results.
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页码:2009 / 2013
页数:5
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