Knowledge Bank

In the microwave spectrum, of chlorocyclopentane, the ground state and a series of vibrationally excited states of the axial conformer have been assigned by Loyd $etal.1$ We reinvestigated the spectrum and were able to assign the ground state (both Cl isotopes) and two excited states ($\mathrm{<mrow\; data-mjx-texclass="ORD">35</mrow>}Cl$ isotope only) of the equatorial conformation. Rotational constants ($A=6424.47(1),B=1832.301(5),C=1532.162(4)MHZ$ for ground state $c-C5H935Cl$), centrifugal distortion constants, and quadrupole coupling constants were determined, as well as improved constants for the axial conformers. The experimental rotational constants have been used to derive plausible structures for both conformations.