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Abstract
The diol host, trans-1,4-bis(hydroxydiphenyl-methyl)cyclohexane has a cyclohexane ring as a rigid framework and a bulky hydroxydiphenyl-methyl group at both ends of the molecule. This host showed a good inclusion ability to form complex crystals with a variety of guest molecules. The complexes with MeOH, acetone, THF, DMF, MeCN and DMSO were obtained as single crystals suitable for X-ray crystallographic study. X-ray structure determination of these crystals clarified that the host:guest complexes show that the guest-dependent polymorphism and crystal structures are classified into five groups. The shape and size of a guest seem to determine the molecular packing in the complex crystal. The guest molecules are included in the columns or cages formed by the hydrophobic groups (benzene and cyclohexane rings) of the hosts, and hydrogen bonded to OH groups of the hosts.