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Journal of Structural Chemistry

2013 year, number 4

AMINO ACID HYDRATION IN AQUEOUS AMMONIUM CHLORIDE AND SODIUM CHLORIDE SOLUTIONS

V. P. Korolev
G. A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, Russia
Keywords: partial volume, amino acid, aqueous salt solutions, hydration numbers

Abstract

Partial volumes V0 of amino acids in aqueous NH4Cl and NaCl solutions are discussed. The salts have different effects on water structure. The contributions of the charged NH3+ and COO groups of amino acids are found. Structural characteristics of hydrated complexes are calculated: partial volumes of water inside and outside the hydration sphere and hydration numbers. The same value of V0(NH3+, COO) is achieved at a higher NH4Cl concentration. The two salt systems with the same V0(NH3+, COO) have similar values of the partial volumes of water and hydration numbers.