Author:
Bowes Katharine F.,Ferguson George,Lough Alan J.,Glidewell Christopher
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—H...N hydrogen bond and by a number of C—H...π(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—N...N hydrogen bonds and a further pair of silanol molecules linked to the first pair via O—H...O 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.
Publisher
International Union of Crystallography (IUCr)
Subject
General Biochemistry, Genetics and Molecular Biology,General Medicine
Cited by
23 articles.
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