TY - JOUR
T1 - A simple empirical model describing the thermodynamics of hydration of ions of widely varying charges, sizes, and shapes
AU - Marcus, Yizhak
PY - 1994/8
Y1 - 1994/8
N2 - Cations and anions and small and large ions are hydrated in different manners, due to the orientation of water molecules around them. Still, a very simple model accounts reasonably well for the thermodynamics of hydration of ions with charges z varying from ± 1 to ± 4, depending only on z and their radii r, when taken as spheres. The model specifies the width of the hydration shell, Δr, the number n of water molecules immobilized and electrostricted in it, proportional to |z|/r, and the bulk and high-field dielectric properties of the water. It accounts for the Gibbs energy, enthalpy, entropy, heat capacity of hydration and the partial molar volumes of the ions.
AB - Cations and anions and small and large ions are hydrated in different manners, due to the orientation of water molecules around them. Still, a very simple model accounts reasonably well for the thermodynamics of hydration of ions with charges z varying from ± 1 to ± 4, depending only on z and their radii r, when taken as spheres. The model specifies the width of the hydration shell, Δr, the number n of water molecules immobilized and electrostricted in it, proportional to |z|/r, and the bulk and high-field dielectric properties of the water. It accounts for the Gibbs energy, enthalpy, entropy, heat capacity of hydration and the partial molar volumes of the ions.
KW - Electrostriction
KW - Model for ion hydration
KW - Thermodynamic functions of hydration
KW - Water structure making, breaking
UR - http://www.scopus.com/inward/record.url?scp=0028133296&partnerID=8YFLogxK
U2 - 10.1016/0301-4622(94)00051-4
DO - 10.1016/0301-4622(94)00051-4
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AN - SCOPUS:0028133296
SN - 0301-4622
VL - 51
SP - 111
EP - 127
JO - Biophysical Chemistry
JF - Biophysical Chemistry
IS - 2-3
ER -