Knowledge Bank

Rotational spectra have been observed for complexes of argon and krypton with pyridine, using a Flygare FTMW $spectrometer.1$ Rotational and centrifugal distortion constants have been determined for Ar-pyridine, Ar-[4-D] pyridine and Kr-pyridine, the latter with Kr-82,83,84, and 86. The noble gas atom sits over the pyridine ring in the complex's plane of symmetry. The Ar to pyridine c.m. distance is 3.549 A, and the line between Ar and the pyridine c.m. makes an angle of $3.40\circ$ from the vertical. The results for Ar-[4-D] pyridine show that the Ar is displaced towards the N. The structure of the pseudodiatomic force constant and well depth for the dimers. The hyperfine structure from $D.\mathrm{<mrow\; data-mjx-texclass="ORD">14</mrow>}N$, and $\mathrm{<mrow\; data-mjx-texclass="ORD">83</mrow>}Kr$ has been analyzed and will be discussed. A search for the $Ar2$-pyridine trimer is in progress. The results will be presented.