TRIARYLMETHANOL HOSTS AND ANALOGS .10. SUPRAMOLECULAR COMPLEXATION OFDMF AND ACETONE INVOLVING SINGLY BRIDGED TRIARYLMETHANOL AND ANALOGOUS HOSTS - X-RAY CRYSTAL-STRUCTURES OF 4 INCLUSION-COMPOUNDS

DMF and acetone inclusions with the 2,7-dibromo-9-phenylfluoren-9-ol h ost (1) and the DMF complexes of the 13-phenyl- (2) and 13-(phenyl-eth ynyl)- (3) derivatives of the 1,3,5-tribenzocycloheptatriene-13-ol hos ts have been studied by X-ray diffraction. All four complexes contain hydrogen bonded (1:1) host-guest associates, which build up the crysta l 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 wh ich the disordered DMF guests reside, The DMF complex of the slightly helical 3 [3 . DMF 1:1)] crystallizes with a chiral space group symmet ry (P2(1)).