The Determination of the Formation Constant of Triiodide Ion in Micellar Solution of Dodecyltrimethylammonium Chloride
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In this article, a tentative estimation based on a lamellar micelle model led to the intrinsic formation constant of triiodide ion of 650 mol−1 dm3 or less at 30 °C, which is comparable with that in water.Abstract:
Spectrophotometric measurements were undertaken at 360 nm in order to estimate the formation constant of triiodide ion in micellar solution of dodecyltrimethylammonium chloride. The absorption spectra of the solutions suggested that both iodine molecule and triiodide ion are solubilized in a hydrophilic surface region of the surfactant micelle. The apparent formation constant of triiodide ion, Ka, was found to be much larger in micellar solution than in water. It was also shown that the value of Ka decreases regularly with increasing surfactant concentration. A tentative estimation based on a lamellar micelle model led to the intrinsic formation constant of triiodide ion of 650 mol−1 dm3 or less at 30 °C, which is comparable with that in water. The thermodynamic consideration revealed that the formation reaction of triiodide ion from iodine and iodide ion in micellar solution is accompanied by an anomalous entropy decrease.read more
Citations
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Micellar catalysis in reaction-rate methods
TL;DR: The use of micellar systems in kinetic-based determinations involving catalysed and uncatalysed reactions is considered in this paper, where different strategies devised so far for increasing sensitivity and selectivity by using such systems are discussed in terms of the roles played by micelles in reaction-rate methods.
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Hexadecylpyridinium chloride micelles for the simultaneous kinetic determination of cysteine and cystine by their induction of the iodine-azide reaction
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TL;DR: In this paper, triiodide ion and hexadecylpyridinium chloride micelles were used to enhance the kinetic spectrophotometric determination of cysteine and cystine by their inductor effect on the IZide reaction.
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A Selective Spectrofluorometric Determination of Micromolar Level of Cyanide in Water Using Naphthoquinone Imidazole Boronic-Based Sensors and a Surfactant Cationic CTAB Micellar System
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Spectrophotometric determination of the formation constant of triiodide ions in aqueous-organic solvent or polymer mixed media both in absence and presence of a surfactant.
TL;DR: The sharp increase in triiodide formation in presence of the polymer under study suggests the possibility of iodine being present as triiodides or other higher polyiodides in the inclusion complexes of iodine with other polymers like starch or PVA.
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Preconcentration and indirect quantification of trace nitrite, nitrate and total nitrite in selected beverage and milk samples using ion-pairing cloud-point extraction with acridine orange
Ramazan Gürkan,Nail Altunay +1 more
TL;DR: In this paper, a new indirect preconcentration method was developed for micellar-sensitive detection of trace nitrite as analyte by spectrophotometry, which is based on selective ion-pairing complex formation of triiodide ion, I3− with acridine orange, AOH+ (3,6-bis(dimethylamino) acridines) at pH 4.0 and its cloud-point extraction (CPE) with Triton X-114 as extracting agent.
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