Abstract
Rotational spectrum of the ground state of 2-fluro-4-picoline has been investigated by pulsed jet Fourier transform microwave spectroscopy. Besides the parent species, all the mono-substituted 13C and 15N isotopologues in natural abundance have been also measured and assigned. The rotational spectrum displays the features of the quadrupole coupling effect of the 14N nucleus with a near-free internal rotation of CH3 top. The V3 barrier (191 (60) J/mol) to the internal rotation of CH3 has been estimated from the unexpected low values of the inertial defects.
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