Tri­phenyl­silanol–4,4′-bipyridyl (4/1): the Z′ = 4 polymorph revisited

A fully ordered structure is reported for the polymorph of tri­phenyl­silanol–4,4′-bipyridyl (4/1), 4C₁₈H₁₆OSi·C₁₀H₈N₂, having Z′ = 4. The asymmetric unit contains four similar but distinct five-mol­ecule aggregates, in which the central bipyridyl unit is linked to two mol­ecules of tri­phenyl­silanol via O—H...N hydrogen bonds, with a further pair of tri­phenyl­silanol mol­ecules linked to the first pair via O—H...O hydrogen bonds. An extensive series of C—H...π(arene) hydrogen bonds links these aggregates into complex sheets. This structure is compared with a previously reported structure [Bowes, Ferguson, Lough & Glidewell (2003). Acta Cryst. B59, 277–286], which was based on an erroneous disordered structural model arising from a false direct-methods solution with reference to a strong pseudo-inversion centre.