Acta Crystallographica Section B

Structural Science

Volume 59, Part 2 (April 2003)

Acta Cryst. (2003). B59, 277-286 [doi:10.1107/S0108768103005196]

The 1:1 adduct of triphenylsilanol and 4,4'-bipyridyl, and three pairwise-concomitant triclinic polymorphs of the 4:1 adduct having Z' = 0.5, 1 and 4

K. F. Bowes, G. Ferguson, A. J. Lough and C. Glidewell

Abstract: Crystallization from methanol solution of mixtures of triphenylsilanol and 4,4'-bipyridyl has given a 1:1 adduct (I), Ph₃SiOH·C₁₀H₈N₂, and three polymorphic 4:1 adducts (II)-(IV), (Ph₃SiOH)₄·C₁₀H₈N₂. In (I), the components are linked by a single O-HN hydrogen bond and by a number of C-H [bold pi] (arene) hydrogen bonds to form a continuous three-dimensional structure. Compounds (II)-(IV) are all triclinic, space group P $\bar 1$ , with Z' values of 0.5, 1 and 4, respectively. The basic hydrogen-bonded aggregate is the same in each of (II)-(IV), having a pair of silanol molecules linked to the bipyridyl via O-NN hydrogen bonds and a further pair of silanol molecules linked to the first pair via O-HO hydrogen bonds. In (II) there is just one such aggregate lying across a centre of inversion (Z' = 0.5) and in (III) there are two such aggregates, both lying across centres of inversion (Z' = 2 × 0.5 = 1). In (IV) there are six independent aggregates of this type, four of which lie across centres of inversion and two of which lie in general positions, so that Z' = (4 × 0.5) + 2 = 4. While the components in (I) are fully ordered, each of (II)-(IV) exhibits extensive disorder involving both the bipyridyl units and the phenyl rings of the silanol components.

Online 26 March 2003


	Structure factor file (CIF format) (256.7 kbytes) Contains datablock I

	Structure factor file (CIF format) (380.0 kbytes) Contains datablock II

	Structure factor file (CIF format) (765.5 kbytes) Contains datablock III

	Structure factor file (CIF format) (3030.8 kbytes) Contains datablock IV

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