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The 1:l molecular complexes between SF,, SOF2, and S02F2 with a wide variety of amines and oxygen-containing bases have been isolated and characterized in nitrogen matrices. All complexes are characterized by a red shift in the S-F stretching modes from that of the parent sulfur fluoride or oxyfluoride, as typified by the bands at 675,830, and 841 cm-' for the SF4.NH3 complex. The magnitude of these shifts to lower energy is dependent upon the strength of the base. In addition, perturbed vibrational modes of the base subunit in the complex were noted for certain complexes, such as the symmetric deformation mode of NH3 in SF4-NH3 complex, at 1050 cm-'. These shifts suggest that these complexes are covalently bonded from the sulfur to the nitrogen or oxygen on the base with the sulfur fluoride or oxyfluoride acting as a d?r* acceptor of electron density from the lone pair on the base. In addition, the spectra indicate an order of Lewis acidity of SF4 > SOF2 > S02F2, where only very weak complexes were observed.

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