Acta Cryst. (2000). B56, 1063-1070 [ doi:10.1107/S0108768100011496 ]
Abstract: Structures of the title compounds are all mediated by strong cooperative arrangements of O-HO hydrogen bonds, supported by a variety of weaker interactions which affect the type of O-HO synthon that is formed. The tetrafluoro compound contains hexameric O-HO synthons in a supramolecular chair conformation, together with CC-HF interactions. However, the tetrachloro and tetrabromo compounds both form tetrameric O-HO synthons. This dominant pattern is supported by halogenhalogen interactions having one C-Cl[Br]Cl[Br] angle close to 180° and the other close to 90°, and by CC-HCl[Br] interactions.
Keywords: gem-Alkynols; Synthons; Interactions.
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