The crystal structure of fluorocarbonylsulfenyl chloride, FC(O)SCI, was det
ermined by X-ray diffraction analysis from crystals obtained at low tempera
ture using a miniature zone melting procedure. The molecule exhibits only o
ne form with C-s symmetry: the C=O double bond syn with respect to the S-Cl
single bond. The matrix Raman spectrum of FC(O)SCl shows features originat
ed by two conformers, which are in equilibrium in the gas phase. Irradiatio
n of the Ar-matrix with UV light of lambda < 300 nm produces randomization.
The pre-resonance Raman effect was also determined for the molecule. Its e
xtension is associated with the planarity of the molecule and it is related
to the pi-->pi* transition in the chromophore. Theoretical calculations re
produce both experimental parameters and vibrational data very well. (C) 19
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