Microwave spectrum,barrier to internal rotation and dipole moment in 5-methyl-pyrimidine |
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Authors: | W Caminati G Cazzoli AM Mirri |
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Institution: | Laboratorio di Spettroscopia Molecolare - C.N.R. and Istituto Chimico ”G. Ciamician“, University of Bologna, Italy |
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Abstract: | The microwave rotational spectrum of 5-methyl-pyrimidine has been investigated in the region from 8 to 27 GHz, the three types of lines to be expected for a molecule of this symmetry and with a very low sixfold barrier hindering internal rotation of the methyl top have been found: m = 0; |m| ≠ 0,3; |m| = 3n. From the m = 0 (a-type transitions) the rotational constants A′ (less methyl top) = 6108.41, B = 2642.198, C = 1844.196 MHz and the dipole moment μ = 2.881D have been determined. From the wide splitting of the lines |m| = 3, |k| = 1 the potential barrier has been derived as V6 = 11.73 cal/mole. |
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