Abstract

Abstract Ultraviolet absorption spectra of two isotopic t-butylamines, (CH3)3CNH2 and (CH3)3CND2, have been observed in their gaseous state in the spectral region 2000–2500 Å. There is an electronic band, whose 0–0 band peaks are observed respectively at 2351.2 and 2334.9 Å. The vibrational structure of the band, caused by the amino wagging vibration, was analyzed. On the basis of the observed energy levels, the potential function of the excited molecule along the amino wagging coordinate was determined; it is nearly harmonic with a small positive quartic term. The dependence of intensity on the vibrational quantum number and the intensity ratio of the fundamental and the hot bands indicate that the equilibrium structure of the amino group is the same as that of methylamine; the angle between the C–N axis and the HNH plane has been determined to be 51± 4°.

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