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J. L. DORAN, B. J. HON AND K. R. LEOPOLD, Department of Chemistry, University of Minnesota, Minneapolis, MN 55455..
Rotational spectra of the NC4H4-CO2 dimer and four isotopologs have been observed using Fourier transform microwave spectroscopy. Analysis of the rotational and quadrupole coupling constants will be presented. Preliminary structural analysis indicates the complex is planar; the CO2 axis is perpendicular to the C2 axis of pyridine with a C-N van der Waals bond length of 2.83 Å. This complex provides the first step in the microsolvation of an organic solute using CO2 as a solvent and therefore may be useful in understanding solute-solvent interactions in supercritical CO2.