Abstract
Abstract DMF and acetone inclusions with the 2,7-dibromo-9-phenylfluoren-9-ol host (1) and the DMF complexes of the 13-phenyl- (2) and 13-(phenyl-ethynyl)- (3) derivatives of the 1,3,5-tribenzocycloheptatriene-13-ol hosts have been studied by X-ray diffraction. All four complexes contain hydrogen bonded (1:1) host-guest associates, which build up the crystal structures by ordinary van der Waals forces, occasionally supported by weak C-H…O interactions. The host-guest aggregates in the 1·DMF (1:1) and the 1·acetone (1:1) compounds show very similar geometry, possibly enforced by the packing forces. The host 2 molecules in the 2·DMF (1:1) complex are arranged so as to form endless tunnels in which the disordered DMF guests reside. The DMF complex of the slightly helical 3 [3·DMF 1:1)] crystallizes with a chiral space group symmetry (P21).
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