			15min:

MICROWAVE SPECTRA AND STRUCTURE OF CF₃I cdots

CO.

S. L. STEPHENS, N. R. WALKER AND A. C. LEGON, School of Chemistry, University of Bristol, Bristol, BS8 1TS, U.K.

A Chirped Pulse Fourier transform Microwave spectrometer has been used to measure the pure rotational spectrum of CF₃I cdots CO. This complex is generated by supersonic expansion of a gas sample containing a small percentage of CF₃I, and CO in argon. The rotational constant B _0, centrifugal distortion constants, Delta _ J and Delta _ JK , and nuclear quadrupole coupling constant for iodine, chi _aa(I), have been determined for each of CF₃I cdots ¹²C¹⁶O, CF₃I cdots ¹³C¹⁶O and CF₃I cdots ¹²C¹⁸O allowing determination of the distance between the two sub-units. The complex is a prolate symmetric top with C _3v symmetry.