Host Polymorphs and Crystalline Host–Guest Complexes of 3,3′-Bis(9-hydroxy-9-fluorenyl)biphenyl

The diol host compound 2 featuring a structure with
two 9-fluorenol moieties attached in 3,3′-position to a biphenyl
core unit has been synthesized and is shown to form crystalline inclusion
complexes with organic guest molecules. Aside from the single-crystal
X-ray structures of unsolvated 2 in two polymorphous
forms (2A, 2B), structures of five inclusion
compounds with 1,4-dioxane (2a), DMSO (2b), diethylamine (2c), acetic acid (2d),
and ethyl acetate (2e) are described and comparatively
discussed in the interaction behavior including corresponding host
compounds with different attachment mode of the biphenyl unit and
the diphenylhydroxymethyl-substituted equivalent.