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- W1998237286 abstract "Thermodynamics of the dimerization of 2-[(2-hydroxy-1-naphthyl)azo]-5-[(4-sulfonatophenyl)azo]benzenesulfonate in the presence of 0.05 mol dm−3 alkali metal cations and tetralkylammonium cations has been studied spectrophotometrically. From the dimerization constant and its temperature dependence, the values of standard enthalpy change and entropy change of dimerization have been calculated. The results show that both of them increase in the order of K+ < Li+ < Na+ < Rb+ < Cs+ and NH4+ < (CH3)4N+ < (C2H5)4N+ < (C3H7)4N+, and further, an enthalpy–entropy compensation relation with the compensation temperature of 300 K does hold. Dimer structure has also been examined using exciton theory. The angle between long molecular axes of monomers in the dimer lies in 43—44° for Na+, K+, Rb+, and Cs+, and is about 52° for Li+, but, that for tetralkylammonium cations has a tendency to increase with an increase in the size of the alkyl chain up to tetraethylammonium ion and somewhat decreases for tetrapropylammonium i..." @default.
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- W1998237286 date "1997-01-01" @default.
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- W1998237286 title "Thermodynamic Study of the Effects of Monovalent Cations on Dimerization of a Dianionic Azo Dye, 2-[(2-Hydroxy-1-naphthyl)azo]-5-[(4-sulfonatophenyl)azo]benzenesulfonate, in Aqueous Salt Solution" @default.
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- W1998237286 doi "https://doi.org/10.1246/bcsj.70.115" @default.
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