Interactions between large organic ions of opposite charge

Mukhayer, G. I.; Davis, S.S.

doi:10.1016/0021-9797(77)90018-2

Cited by 17 publications

(3 citation statements)

References 21 publications

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“…Because of attraction of opposite charges, ions take up an equilibrium separation set by the dielectric constant of water and the solvation shield around each ion (2). Second, for surface active ions, association is favored by the tendency of hydrophobes to associate in water (3). Hydrophobic association can be very significant ff the surfactant ions have large hydrophobes.…”

Section: Di$rmentioning

confidence: 99%

“…Hydrophobic association can be very significant ff the surfactant ions have large hydrophobes. For example, Mukayer and Davis have found that, below 19 C, the interaction of benzyl triphenyl phosphonium chloride and sodium dodecyl sulfate (SDS) is driven more by hydrophobic association than by electrostatic attraction (3). At higher temperatures, however, the dielectric constant of water decreases and electrostatic attraction dominates association.…”

Section: Di$rmentioning

confidence: 99%

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The interaction of dimethyl ditallow ammonium chloride and sodium linear alkylbenzene sulfonate

Smith¹,

Cox²,

Russell³

et al. 1989

J Americ Oil Chem Soc

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The interaction of a commercial sample of dimethyl ditallow ammonium chloride (Adogen| 470E) and sodium alkylbenzene sulfonate (C-550 LAS) in aqueous solution was examined. Interaction was very strong, with the ion pair association constant estimated to be 1 x 106 l/mol. At laundry use level concentrations, the mixtures were turbid. The highest turbidity was found at equimolar concentrations of C-550 LAS and Adogen| 470E. Turbidity was assumed to be due to the formation of an insoluble 1:1 complex.Both filtered and unfiltered mixtures of C-550 LAS and Adogen@ 470E were evaluated for detergency, softening and antistat performance. As the mixtures approached 1:1 stoichiometry, detergency decreased and softening and antistat performance improved. Lower detergency was explained by the loss from solution of LAS to form a 1:1 LAS-dimethyl ditallow ammonium complex. Improved softening and antistat perfromance were explained by adsorption of the insoluble complex on the cloth.Dimethyl ditallow ammonium chloride used in all measurements was also a commercial product, Adogen| 470E fabric softener concentrate. The properties of this material are given in Table 1.Concentration range of mixtures. Detergency, static decay and softening measurements were made on mixtures of C-550 LAS and Adogen| 470E over the range 10 .3 M-10 -4 M. This range corresponds to typical laundry use concentrations.Detergency. Two series of solutions were evaluated for detergency and soil deposition. In one series, C-550 LAS was mixed with Adogen@ 470E and the detergency of the mixtures was evaluated. In the second series the mixtures were first vacuum filtered through a Whatman 42 filter, and the detergency of the filtrate was then evaluated. Three mineral oil-soiled permanent press cloths and three unsoiled permanent press cloths were washed in a

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Section: Di$rmentioning

confidence: 99%

Section: Di$rmentioning

confidence: 99%

The interaction of dimethyl ditallow ammonium chloride and sodium linear alkylbenzene sulfonate

Smith¹,

Cox²,

Russell³

et al. 1989

J Americ Oil Chem Soc

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“…The association of aryl and alkylsulfonates, alkylsulfates, alkylborates, and other anions with cations such as alkyl and arylammonium, tetraphenylarsonium, and tetraphenylphosphonium has been reported. 2,6,11 Other phenomenon, typical for aqueous dye solutions, is the association of dye ions with surfactant ions of opposite charge within the concentration range below the critical micelle concentration (cmc) of surfactant homomicelles, leading to step-by-step formation of poorly soluble salts and mixed dye-surfactant micelles. 12,13 The interactions of such a kind are often accompanied by prominent changes in the Vis spectra as, for instance, in the case of the association of hydroxyxanthene anions with quaternary ammonium drugs, 14 or of the cationic dye neutral red with n-dodecylsulfate.…”

Section: Introductionmentioning

confidence: 99%

Association of indopolymethine cyanine cations with anions of sulfonephthalein and xanthene dyes in water

Shapovalov¹,

Koval²,

Chernaya³

et al. 2005

J. Braz. Chem. Soc.

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A associação do corante catiônico indoeptametinocianina com vários corantes aniônicos (quatro sulfonaftaleínas e cinco xantinas) em solução aquosa foi investigada usando espectroscopia de absorção no visível. Os valores das constantes de associação estão na faixa de 10 4 a 7 × 10 7 mol -1 L. Em todos os casos, um efeito hipocrômico significativo foi observado para a banda de absorção do cátion (λ max = 737 nm). O mesmo foi observado para a interação do cátion indotrimetínio (λ max = 540 nm) com espécies aniônicas. Interações eletrostáticas, de Van der Waals e hidrofóbicas são identificadas como as forças que dirigem esta associação. A adição de surfatantes iônicos destrói os compostos de associação do corante, primeiramente devido à interação com os íons de corante com carga oposta. Este processo é acompanhado pela restauração dos espectros de absorção visível dos corantes aniônico e catiônico.The association of the cationic dye indoheptamethine cyanine with various anionic dyes (four sulfonephthaleins and five xanthenes) in aqueous solutions was detected using the Vis-spectroscopic method. The values of the association constants are within the range (10 4 to 7×10 7 mol -1 L). In all the cases a substantial hypochromic effect is observed for the Vis absorption band of the cation (λ max = 737 nm). The interaction of indotrimethinium cation (λ max = 540 nm) with anionic species manifests itself in analogous manner. Electrostatic, Van der Waals, and hydrophobic interactions are regarded as driving forces of the association. Addition of ionic surfactants destroys the dye associates, primarily due to interactions with the oppositely charged dye ions. This process is accompanied by the restoration of the initial Vis absorption bands of both the cationic and the anionic dye.

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