The Microwave Spectrum of 2,6-Difluoropyridine

II. Dipole Moment, Quadrupole Coupling Constants and Vibrational Satellites

Otto L. Stiefvater 1 , Stephen Lui 2  and John A. Ladd 2
  • 1 School of Physical and Molecular Sciences, University College of North Wales, Bangor, Gwynedd, U.K.
  • 2 Department of Chemistry and Applied Chemistry, University of Salford, Salford, Lancashire, England

Hyperfine splittings of rotational transitions of 2,6-difluoropyridine have been analysed to yield the 14N quadrupole coupling constants. Their values are:

Χaa = 1.82 ± 0.05 MHz, Χbb = - 4.16 ± 0.02 MHz, Χcc = 2.34 ± 0.05 MHz. The electric dipole moment has been determined from Stark effects as fi = 3.82 ± 0.06 D, and satellites in the rotation spectrum have been correlated with the five lowest fundamental vibrations of this molecule.

The dipole moment, the quadrupole data and the structural differences between 2,6-difluoropyridine and pyridine itself can all be accounted for by the change in the electron distribution due to the fluorine substituents.

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