Abstract
Rotational spectra of two isotopomers of the 2,5-dihydrofuran/ClF complex were observed by using the fast-mixing nozzle/Balle-Flygare spectrometer combination. The complex has C s symmetry and a pyramidal configuration at oxygen. The angle between the 35ClF axis ( z) and the a-axis, α az = 17.95(3)°, was determined from the Cl nuclear quadrupole coupling tensor. The geometry r( O… Cl) = 2.422(5) A ̊ , θ = 127.0(3)° and θ = 1.99(15)° is established when rotational constants are fitted under the constraints of unperturbed monomers and α az = 17.95(3)°. the configurations θ at O and the nonlinearities θ of the B…ClF/B…HCl systems are compared for B = 2,5-dihydrofuran and oxirane.
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