The crystal structure of t-Bu2Si(OH)F. A cyclic hydrogen-bonded tetramer

An X-ray diffraction study has shown that t-Bu2Si(OH)F crystallizes as hydrogen-bonded tetramers. The fluoride ligand does not take part in the hydrogen bonding, which involves OH--O linkages with an OH--O angle of 160°; the O---O---O angles are 89.7(3)°, but the four oxygen atoms are not quite coplanar (space group I 4 ). The t-BuSiBu-t angle is 120.5(6)°.