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Prediction of the Polar Morphology of Sodium Chlorate Using a Surface-Specific Attachment Energy Model

1998; American Chemical Society; Volume: 102; Issue: 36 Linguagem: Inglês

10.1021/jp980456r

1520-6106

G. Clydesdale, Kevin J. Roberts, G. B. Telfer, V. R. Saunders, D. Pugh, Robert A. Jackson, Paul Meenan,

Crystallography and molecular interactions

A morphological prediction of the polar crystal morphology of the molecular ionic solid sodium chlorate is presented. This prediction uses interatomic potential calculations that employ surface-specific attachment energy calculations associated with an ab initio calculation of surface charges via a Hartree−Fock calculation using periodic boundary conditions. The data predicts assignment of the absolute polarity of the crystal with respect to the published crystal structure (Burke-Laing, M. E.; Trueblood, K. N. Acta Crystallogr. 1977, B33, 2698), which reveals the chlorate-rich {−1 −1 −1} to be the observed form rather than its sodium-rich Freidel opposite, {111}. The predicted crystal morphology is in reasonable agreement with observed morphologies, although there is an underestimation of the dominant {200} form. The latter is rationalized with experimental data in terms of a face-specific solvent binding model.