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Solvation Structures and Dynamics of the Magnesium Chloride (Mg2+-Cl-) Ion Pair in Water-Ethanol Mixtures

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Title Solvation Structures and Dynamics of the Magnesium Chloride (Mg2+-Cl-) Ion Pair in Water-Ethanol Mixtures
 
Creator CHATTERJEE, A
DIXIT, MK
TEMBE, BL
 
Subject MOLECULAR-DYNAMICS
HYDRATION SHELL
MGCL2 SOLUTION
RAMAN CRYSTALLOGRAPHY
COMPUTER-SIMULATIONS
METAL-IONS
ARRANGEMENT
CA2+
POTENTIALS
CHEMISTRY
 
Description We have performed constrained molecular dynamics simulations of magnesium chloride in water-ethanol mixtures. From the potentials of mean force (PMFs) of the Mg2+-Cl- ion pair, we notice that, as the mole fraction of ethanol increases, the depths of the minima of the contact ion pair (CIP) and solvent assisted ion pair (SAIP) increase, but the depth of the CIP minimum increases more in comparison to the SAIP minimum. This shows that ion pairing becomes more favorable with an increase in the mole fraction of ethanol. Significant differences in the PMFs between the Mg' and the cr ion (depending upon whether the second cr ion is present in the first coordination shell of the Mg2+ ion or not) seem to have been reported for the first time in this work. The local mole fraction of water molecules in the first solvation shell of ions is generally greater than in the bulk. The diffusional behavior of solvent molecules in solvation shells of the ion-pair indicates that the ions as well as the first solvation shells of the ions diffuse at much slower rates. Also, the diffusion constant of bulk water in the mixtures is greatly reduced compared to the pure solvent value.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-10-16T15:33:16Z
2014-10-16T15:33:16Z
2013
 
Type Article
 
Identifier JOURNAL OF PHYSICAL CHEMISTRY A, 117(36)8703-8709
http://dx.doi.org/10.1021/jp4031706
http://dspace.library.iitb.ac.in/jspui/handle/100/15913
 
Language en