Hypofluorous acid, hydrogen bonding

Perhaps the best demonstration of the unwillingness of covalently bonded fluorine to participate in hydrogen bonding is hypofluorous acid, HOF. This... 

At room temperature hypofluorous acid HOF is a gas. Its colorless solid (mp = 156 K) melts to a pale yellow liquid. In the crystal structure, O-F = 144.2 pm, angle H-O-F =101°, and the HOF molecules are linked by O-H- O hydrogen bonds (bond length 289.5 pm and bond angle O-H- O 163°) to form a planar zigzag chain, as shown below ... 

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