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Effect of Alkanediyl‐α,ω‐Type Cationic Dimeric (Gemini) Surfactants on the Reaction Rate of Ninhydrin with [Cu(II)‐Gly‐Tyr] + Complex
Author(s) -
Kumar Dileep,
Neo KianEang,
Rub Malik Abdul
Publication year - 2016
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-015-1754-y
Subject(s) - chemistry , ninhydrin , bromide , pulmonary surfactant , cationic polymerization , reaction rate constant , kinetics , reaction rate , microemulsion , medicinal chemistry , inorganic chemistry , nuclear chemistry , polymer chemistry , organic chemistry , catalysis , amino acid , biochemistry , physics , quantum mechanics
The effect of gemini (16‐ s ‐16, s = 4, 5, 6) surfactants on the reaction rate of ninhydrin with [Cu(II)‐Gly‐Tyr] + complex was determined using a spectrophotometric technique. The ninhydrin concentration was kept in excess in order to maintain pseudo‐first‐order conditions. The reaction followed irreversible first‐ and fractional‐order kinetics with respect to [Cu(II)‐Gly‐Tyr] + and [ninhydrin], respectively. It is found that gemini surfactants effectively catalyze the reaction. The rate constants ( k ψ ) first increase and then become relatively constant with increasing gemini surfactant concentration similar to conventional cetyltrimethylammonium bromide. At higher gemini surfactant concentration a third region of increasing k ψ is observed. The unusual third region is ascribed to changes in micellar morphology. The kinetic data has been analyzed using a micellar pseudo‐phase model.