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Hydrolytic Cleavage of Paraoxon by Octanohydroxamate Ion in Cationic Microemulsions
Author(s) -
Satnami Manmohan L.,
Dewangan Hitesh K.,
Nagwanshi Rekha
Publication year - 2016
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.21018
Subject(s) - chemistry , microemulsion , paraoxon , cationic polymerization , bromide , hydrolysis , butanol , decane , hexadecane , hexane , pulmonary surfactant , organic chemistry , nuclear chemistry , inorganic chemistry , ethanol , biochemistry , acetylcholinesterase , enzyme
The hydrolysis reaction of O,O ‐diethyl O ‐ p ‐nitrophenylphosphate (Paraoxon) with the octanohydroxamate ion (OHA − ) was studied in a cationic oil‐in‐water (O/W) microemulsion system over a pH range 7.5–12.0 at 300 K. The O/W systems are stabilized by using cationic surfactant, cetyltrimethylammonium bromide (CTAB), and n ‐butanol as cosurfactants. In a microemulsion, the rate enhancement by OHA − is greater toward the cleavage of paraoxon than its spontaneous (2.1 × 10 7 s −1 ) hydrolysis. The k obs values for the reaction of paraoxon with OHA − were determined in different microemulsion compositions with varying chain length of alcohols ( n ‐butanol, n ‐pentanol, n ‐octanol, and n ‐dodecanol) and alkanes ( n ‐hexane, n ‐heptane, and n ‐decane). The effects of water content, pH, and size of the oil pool have been discussed.