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The barrier heights (V 3 ) hindering methyl internal rotation were determined with microwave Fourier transform spectroscopy from the ground vibrational state for the title molecules and found to be V 3  = 3.336(52) kcal/mol for ethyl isocyanide, V 3  &gt; 3.1 kcal/mol for iso-propyl isocyanide, V 3  = 2.894(23) kcal/mol for gauche-n-propyl isocyanide and V 3  = 2.954(22) kcal/mol for transn- propyl isocyanide. The quadrupole coupling constants of iso-propyl isocyanide are χ aa  = 179.3(31) kHz, χ bb  = -140(15) kHz and χ cc  - 39(15) kHz; the constants of trans-n-propyl isocyanide were determined to be χ aa  = 268.1 (71) kHz, χ bb  = - 108(23) kHz and χ cc  = - 160(23) kHz.

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Methyl Internal Rotation and  14 N Nuclear Quadrupole Coupling from the Rotational Spectra of Ethyl Isocyanide, iso-Propyl Isocyanide and gauche- and trans-n-Propyl Isocyanide