Abstract
The rotational spectra of three isotopic species C 4H 6O⋯H 35 Cl, C 4H 6O⋯H 37 Cl and C 4H 6O⋯D 35 Cl of the hydrogen-bonded dimer formed by cyclobutanone and hydrogen chloride have been studied by means of microwave spectroscopy in a supersonic jet. Rotational constants, centrifugal distortion constants and Cl-nuclear quadrupole coupling parameters have been determined for the ground state and for a vibrationally excited state attributable to the ring-puckering motion of the cyclobutanone subunit. The spectroscopic constants have been interpreted in terms of a C s symmetry in which the monomers are coplanar with: r(O⋯H)=1.88(3) Å, ∠(CO⋯H)=112.3(7)° and a deviation θ of the O⋯H–Cl nuclei from collinearity of 13.1(6)°.
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