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  • Title: The hydration structure of Sn(II): an ab initio quantum mechanical charge field molecular dynamics study.
    Author: Lim LH, Hofer TS, Pribil AB, Rode BM.
    Journal: J Phys Chem B; 2009 Apr 02; 113(13):4372-8. PubMed ID: 19253986.
    Abstract:
    The structural properties of the hydrated Sn(2+) ion have been investigated using ab initio quantum mechanical charge field molecular dynamics (QMCF MD) simulations at double-xi HF quantum mechanical level. The results from the work significantly extend previous study using QM/MM MD simulation and are in good agreement with X-Ray and EXAFS diffraction experiments. The data indicate a set of characteristics for the first hydration shell uncommon among metal ions. Although frequent ligand exchange prevents the formation of a well defined structure, more detailed analyses reveal an asymmetric distribution of ligands around Sn(II). An average of eight water molecules coordinate with the Sn(2+) ion and are distributed at proximal and distal positions that are distinguishable from the second hydration shell and manifest dissimilar degrees of lability.
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