This is the gas-phase structure of hypofluorous acid:
The solid-phase structure however has a bond angle of 101 degrees. Why is there a difference in the solid and gas phase bond angles?
Is this due to packing in the solid-phase? In the solid-phase the molecules should be much closer together than in the gas-phase, so I expect more intermolecular forces and interactions. However, what exactly would be responsible for the angle expansion in the solid phase? From one book I read that bond lengths often differ among the phases.
So what exactly is behind the bond angle expansion in the solid phase?