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- W2040382666 abstract "The apparent second stage dissociation constants of piperazine-N,N-bis[2-hydroxypropanesulfonicacid] (POPSO), N-[2-hydroxyethy1]piperazine-N‘-3-propane sulfonic acid (HEPPS), 2-[N-cyclohexylamino]ethanesulfonic acid (CHES) and mono[tris(hydroxymethyl)aminomethane] phosphate (Trizma) were determined at (25.0 ± 0.1) °C and I = 0.1 mol dm-3 (KNO3) by potentiometric pH titration in pure water and different hydroorganic solvent media. The organic solvents used were methanol and ethanol as amphiprotic hydrogen bond acceptor−donor (HBA-D) solvents, N,N-dimethylformamide (DMF), dimethy1 sulfoxide, acetone, and dioxane as hydrogen bond acceptor solvents, and acetonitrile as an HBA−HBD solvent. The ESAB2M computer program was used to refine the initial estimates of the apparent second-stage dissociation constants of the four zwitterionic buffers studied. pka2* values change with increasing organic content of the solvent mixture. The results obtained are discussed in terms of average macroscopic properties of the mixed solvents. The implications of the results with regard to specific solute−solvent interacions, particularly stabilization of zwitterionic species, are discussed. The effects of coorganic solvents on the acid dissociation equilibria have been interpreted using solvatochromic quantitative values of Kamlet−Taft hydrogen bond acidity and basicity (α, β) and dipolarity−polarizability π* of the solvent." @default.
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- W2040382666 date "1999-05-25" @default.
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- W2040382666 title "Medium Effect on the Apparent Second Stage Dissociation Constants of Some Zwitterionic Buffers for Physiological Research in Various Water + Organic Solvent Mixtures" @default.
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- W2040382666 doi "https://doi.org/10.1021/je980313y" @default.
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