PROPERTIES OF A COMPLEX OF CARBON-DIOXIDE AND CHLORINE MONOFLUORIDE FROM ROTATIONAL SPECTROSCOPY - IDENTIFICATION OF AN EXTREMELY WEAK INTERACTION

The ground-state rotational spectra of three isotopomers, )-C-12-O-16. ..(ClF)-Cl-35,(CO2)-C-12...(ClF)-Cl-37 and (CO2)-C-13...(ClF)-Cl-35, o f a complex formed by carbon dioxide with chlorine monochloride have b een observed by pulsed-nozzle, Fourier-transform microwave spectroscop y. The following values of the spectroscopic constants B-0, D-0, H-0, chi(Aa)(Cl) and M-bb(Cl) have been determined for this linear (or near ly linear) molecule. [GRAPHICS] Interpretation of the spectroscopic co nstants reveals that the nuclei lie in the order OCO...CIF, with r(O.. .Cl) = 2.699(2) Angstrom, and that the intermolecular band is very eas ily distorted both radially and angularly. A comparison of the series B HF and B...CIF for B = Ar, N-2, CO or CO2 establishes that CO2...ClF is anomalous in respect of the strength of its binding. (C) 1997 Else vier Science B.V.