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—H⋯O=As hydrogen-bonding sequences about an inversion centre, with O⋯O = 2.528 (3) A. The monomer unit has a tetrahedral AsO3CPh entity. The As—O—Si angle [140.79 (12)°] is larger than any previously reported AsV—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) A, respectively, for the As=O, As—OH and As—OSiPh3 bonds.
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