Abstract

The ground-state rotational spectra of SO 2… 35ClF and O 2… 37ClF were observed by using a fast-mixing nozzle/pulsed Fourier transform microwave spectrometer combination. Rotational constants, centrifugal distortion constants and the complete Cl-nuclear quadrupole coupling tensor were determined in each case. Interpretation of the spectroscopic constants shows that the complex has a planar geometry with ClF forming a weak bond to one of the O atoms of SO 2 [ r( O… Cl) = 2.733(11) A ̊ ] in a cis arrangement with respect to the SO double bond [ φ = 228.4(6)°]. The O…ClF nuclei deviate from collinearity by only θ = −0.7(2)°.

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