Knowledge Bank

Rotational spectra of the NC$\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}$H$\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}$-CO$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ 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 CO$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ axis is perpendicular to the C$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ axis of pyridine with a C-N van der Waals bond length of 2.83 $\backslash AA$. This complex provides the first step in the microsolvation of an organic solute using CO$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ as a solvent and therefore may be useful in understanding solute-solvent interactions in supercritical CO$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$.