Infrared spectra of the OCS–N2O complex and observation of a new isomer

Vibration–rotation spectra of the OCS–N2O van der Waals complex are studied by means of direct infrared absorption spectroscopy. Three bands are observed and analyzed; one band corresponding to a previously observed isomer, a, and two bands due to a new isomer, b. Both isomers are planar with a slipped near-parallel geometry. The intermolecular (center of mass) separation of isomer a which has been previously determined from its rotational spectrum is 3.5123(2) Å. In isomer b, this separation increases to 3.8674(9) Å. Evident similarities of these two structures to those of isomers a and b of the OCS–CO2 complex are discussed.