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Kinetic and mechanistic investigations of [Zn (II)‐Trp] + and ninhydrin in aqueous and cationic CTAB surfactant
Author(s) -
Kumar Dileep,
Rub Malik Abdul
Publication year - 2019
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.3997
Subject(s) - chemistry , pulmonary surfactant , aqueous solution , cationic polymerization , ninhydrin , bromide , micelle , reaction rate constant , inorganic chemistry , kinetics , microemulsion , nuclear chemistry , organic chemistry , amino acid , biochemistry , physics , quantum mechanics
Kinetic and mechanistic investigations of [Zn (II)‐Trp] + and ninhydrin in aqueous and cationic cetyltrimethylammonium bromide (CTAB) surfactant have been executed in CH 3 COOH‐CH 3 COONa buffers of pH 5.0. Spectrophotometric as well as conductometric techniques were employed to carry out the study at experimental temperature. The values of rate constant ( k obs in aqueous and k ψ in CTAB surfactant) and binding parameters ( K B for [Zn (II)‐Trp] + and K N for ninhydrin) have been determined by the means of a computer program referred to as linear least squares technique. Fractional‐ and first‐order kinetics were found in ninhydrin and [Zn (II)‐Trp] + , respectively, in aqueous and cationic CTAB. Study was catalyzed and accelerated by CTAB surfactant. An increase in CTAB surfactant concentration from 0 to 45 mmol kg −1 resulted to an increase in k ψ from 2.5 × 10 −5 s −1 to 22.7 × 10 −5 s −1 . Surfactant concentration beyond 45 mmol kg −1 had a slow decreasing effect in k ψ . In order to elucidate CTAB effect on k ψ , a pseudo‐phase model of micelles was applied.