Microwave spectrum, structure, and quadrupole coupling for the ethylenendash;hydrogen cyanide complex

摘要

Microwave spectra for the complexes ethylenendash;HCN and ethylenendash;DCN were observed with the pulsed beam, Fourier transform spectrometer. The complexes are lsquo;lsquo;Trsquo;rsquo; shaped with the HCN hydrogen atom adjacent to the Cndash;C double bond of ethylene. The HCN molecule lies on a line perpendicular to the plane of ethylene and passing through the ethylene center of mass. The HCN carbon atom is 3.702(10) Aring; above the ethylene plane. The nitrogen quadrupole coupling strength iseQqaa(N)=minus;4.363(2) MHz for ethylenendash;HCN andeQqaa(N)=minus;4.396(3) MHz for ethylenendash;DCN. The deuterium quadrupole coupling strength iseQqaa(D)=0.178(7) MHz for ethylenendash;DCN. The anisotropy in the nitrogen quadrupole couplingeQ(qbbminus;qcc)(N) is 0.013(3) MHz for ethylenendash;HCN and 0.047(12) MHz for ethylenendash;DCN. The rotational constants are Centrifugal distortion constantsDJandDJKwere obtained.