Acta Cryst. (2004). E60, m222-m224  [ doi:10.1107/S1600536804001217 ]

The arsenic(V) compound PhAs(O)(OH)(OSiPh₃)

G. Ferguson, B. J. O'Leary and T. R. Spalding

Abstract: The structure of the arsenosilicate compound, hydroxooxo(phenyl)(triphenylsiloxy)arsenic(V), PhAs(O)(OH)(OSiPh₃) or [As(C₆H₅)(C₁₈H₁₅OSi)O(OH)], is dimeric with the monomers joined by two As-O-HO=As hydrogen-bonding sequences about an inversion centre, with OO = 2.528  (3)  Å. The monomer unit has a tetrahedral AsO₃C_Ph entity. The As-O-Si angle [140.79  (12)°] is larger than any previously reported As^V-O-Si angle in a molecular species. The three independent As-O bond lengths are 1.6551  (18), 1.6740  (18) and 1.7086  (17)  Å, respectively, for the As=O, As-OH and As-OSiPh₃ bonds.

Online 30 January 2004

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