Anthracene Based Bulky diol Hosts.crystal Structures of a Free Host and of Inclusion Compounds with Dipolar guests

摘要

X-ray crystal structures are reported of a free host compound 1,comprising two diphenylmethanol terminal groups attached to a centrla 9,10-ethynyl substituted anthracene unit,and of three inclusion compounds of a fluoren-9-ol substituted analogous host 2 with acetone,dimethyl sulphoxide (DMSO) and dimehtylformamide (DMF) as guest,respectively.Despite the presence of two hydroxyl groups in 1,there is no O-H...O hydrogen bond between the molecules in the guest free crystal - only weaker C-H ...O interactions and van der Waals' type connections.In inclusion compounds of 2,H-bonded 1:2 host-guest associates are formed,where each of the host hydroxyl groups binds to a guest oxygen atom.The orientations of the host-guest connections in these complexesvry,being E for acetone and Z for both DMSO and DMF guests,relative to the hsot anthracene unit.The DMSO and DMF inclusion compounds of 2 proved to be isostructural.