The microwave ground state spectra of tert.-butyl isocyanide, (CH3)3CNC, and phenyl isocyanide, C6H5NC, have been measured by microwave Fourier transform spectroscopy in the region 5.0 to 8.0 GHz and analysed for nuclear quadrupole hyperfine splitting due to 14N. The nuclear quadrupole coupling constants are shown to be in accordance with structural predictions of the p-electron population at the nitrogen atom. The dipole moment of phenyl isocyanide was derived from the Stark effect of the JK-K+ = 202 - 101 transition.
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