Knowledge Bank

The microwave spectrum of 2-chloroacrylonitrile has been studied in the 26.5 - 40.0 GHz region. Both a- and b-type rotational transitions have been measured and assigned for both chlorine isotopes. The ground state rotational constants for $CH2=C35$Cl(CN) are (in MHz) $A=6973.25$, $B=3148.15$ and $C=2165.94$. The rotational constants compare exceptionally well with those calculated from the structures of vinyl cyanide$\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$ and vinyl $chloride.2$ The microwave spectrum of mathylene cyanide$\mathrm{<mrow\; data-mjx-texclass="ORD">3</mrow>}$ has been reinvestigated and the distortion effects of $CH2$(CN)$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ and $CH_{2} = $C Cl(CN) have been studied. For $CH2$(CN)$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ transitions up to $J=62$ have been measured. The quartic distortion constants for $CH2$(CN)$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$ are (In MHz): $\Delta J=(1.855455\pm 0.014)\times 10-3$, $\Delta JK=(-6.79218\pm 0.027)\times 10-2$, $\Delta K=(8.621623\pm 0.013)\times 10-1$, $\delta J=(4.892607\pm 0.016)\times 10-4$ and $\delta k=(6.7501\pm 0.29)\times 10-3$, Quoted errors are twice the standard deviations.