The rotational spectra of cyclobutane-1,2-dione in the ground state and the first three vibrationally excited states associated with the out-of-plane ring mode establish that the heavy atoms in the molecule are coplanar; the measured electric dipole moment in the ground state is µ=µb= 3·82 ± 0·02 D.
A. C. Legon, J. Chem. Soc., Chem. Commun., 1973, 612 DOI: 10.1039/C39730000612
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