Title: The Microwave Spectrum of 2,6-Lutidine, Analysis of Internal Rotation and 14 N Hyperfine Structure
Abstract: Abstract The rotational spectrum of 2,6-lutidine, (CH 3 ) 2 C 5 H 3 N, has been recorded between 6 and 26.5 GHz using pulsed molecular beam microwave Fourier transform spectroscopy. The rotational constants are A = 3509.7139(84) MHz, B = 1906.8639(101) MHz, and C = 1254.6215(14) MHz, the barrier to internal rotation of the two methyl groups is V 3 = 1.1752 kJ/mol, their moments of inertia were found to be I α = 3.0808(9) uÅ 2 . The nitrogen nuclear quadrupole constants are χ aa = +1.600(5) MHz, χ bb = -4.572(3) MHz and χ cc = +2.972(5) MHz.