Knowledge Bank

“The microwave spectrum of chloroallene has been investigated in the X-band region. The spectroscopic parameters obtained from the zero -order frequencies are $b=2850.43,c=2665.20$; and $b=2788.59,c-=2609.74$, all in Mc/sec, for the $Cl36$ and $Cl37$ species, respectively. Using additional assumptions based on allene, the following set of structural parameters was found to be in good agreement with the experimental moments of inertia: $d(C1C2)=d(C2C3)=1.309$ A. $d(CaCl)=1.736$ A and / $C2C3Cl=122.2\circ$. The quadrupole coupling constants for $Cl35$ and $Cl37$ respectively, are; ($eqQ)aa=-41.5$, $(eqQ)bb=35.3$; and $(eqQ)aa=-32.8,(eqQ)bb=28.3$, all in Me/sec. Calculations based on the above structure indicate that $\pi$-electron transfer is comparable to that in vinyl chloride, but that $C-Cl$ bond asymmetry appears to he somewhat lower.”