The nature of the interaction of molecular fluorine and Lewis bases B froma comparison of the properties of B center dot center dot center dot F-2 and B center dot center dot center dot HF

Comparison of angular geometries, radial geometries and intermolecular stre tching force constants k(sigma) of the two series of complexes B ... F-2 an d B ... HF, where B is H2S, HCN, CH3CN, H2O, (CH2)(2)O or NH3, allows concl usions about the nature of the interaction in B ... F-2 and the shape of th e F atom in F-2.