Abstract
Useful information about hydrogen bonding, the preferred modes of hydrophobic interaction and conformational preferences of a specific molecule can be obtained from cocrystallization of the solute with a selected series of solvent molecules. This method is used in a study of nine different crystal structures of diethylstilbestrol (DES) solvates. It is shown that solvent inclusion results not only in stronger hydrogen bonds, but usually also in a larger number of favorable C-H.pi interactions between DES molecules. Furthermore, solvent molecules such as DMSO, DMF, acetonitrile and acetone demonstrate important hydrogen-bond donating properties in addition to their more familiar role as hydrogen-bond acceptors. Molecular conformations in the crystal structures compare favorably with results from molecular mechanics calculations.
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