TY - JOUR
T1 - Thermodynamics of ion hydration and its interpretation in terms of a common model
AU - Marcus, Yizhak
PY - 1987/1/1
Y1 - 1987/1/1
N2 - The relationship between the conventional standard molar thermodynamic quantities of hydration of an ion and the corresponding quantities of solvation, that are due entirely to its interactions with its aqueous environment, is presented. The TATB assumption, i.e., that quantities pertaining to the tetraphenyl-arsonium cation equal those pertaining to the tetraphenylborate anion, is applied to the standard enthalpy, entropy, and Gibbs energy of hydration of ions, and to the standard partial molar heat capacity and volume of aqueous ions. A model of the hydrated ion, consisting of a layer of completely immobilized water molecules surrounded by a dielectric continuum affected by the field of the ion and water the structure of which is modified, is presented. The thickness of the first layer and the number of water molecules in it is proportional to the radius of the ion. The model is shown to be compatible with all these thermodynamic quantities.
AB - The relationship between the conventional standard molar thermodynamic quantities of hydration of an ion and the corresponding quantities of solvation, that are due entirely to its interactions with its aqueous environment, is presented. The TATB assumption, i.e., that quantities pertaining to the tetraphenyl-arsonium cation equal those pertaining to the tetraphenylborate anion, is applied to the standard enthalpy, entropy, and Gibbs energy of hydration of ions, and to the standard partial molar heat capacity and volume of aqueous ions. A model of the hydrated ion, consisting of a layer of completely immobilized water molecules surrounded by a dielectric continuum affected by the field of the ion and water the structure of which is modified, is presented. The thickness of the first layer and the number of water molecules in it is proportional to the radius of the ion. The model is shown to be compatible with all these thermodynamic quantities.
UR - http://www.scopus.com/inward/record.url?scp=0000877164&partnerID=8YFLogxK
U2 - 10.1351/pac198759091093
DO - 10.1351/pac198759091093
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AN - SCOPUS:0000877164
SN - 0033-4545
VL - 59
SP - 1093
EP - 1101
JO - Pure and Applied Chemistry
JF - Pure and Applied Chemistry
IS - 9
ER -