The stereochemistry of some organic derivatives of group VB elements. Part III. The crystal and molecular structure of triphenylarsine oxide monohydrate

Journal of the Chemical Society A: Inorganic, Physical, Theoretical Pub Date: DOI: 10.1039/J19690000001

Abstract

The crystal structure of triphenylarsine oxide monohydrate has been determined from three-dimensional photographic data. The crystals are monoclinic, space group P21/c, with four molecules of Ph3AsO·H2O in a unit cell of dimensions a= 11·14, b= 16·65, c= 11·41 ?, β= 130·7°. The structure was solved by the heavy-atom method and refined by full-matrix and block-diagonal least-squares calculations. R is 0·114 for 2187 independent reflexions. The crystal structure comprises discrete centrosymmetric dimers with each water molecule hydrogen bonded to two oxygen atoms of triphenylarsine oxide molecules and vice-versa. The O(H)? O distances are 2·78 and 2·81 ?. The triphenylarsine oxide molecule possesses no symmetry because of unequal rotations of the phenyl rings atound the C–As bonds. Some molecular dimensions are As[double bond, length as m-dash]O 1·644 ± 0·007, As–C 1·907 ± 0·009 ?, C–As–C 108·0, and C–As–O 110·9°.

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