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Far Infrared Group Frequencies. II. Primary Amines

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The far infrared spectra of a number of aliphatic amines have been recorded as dilute solutions in cyclohexane. A characteristic band with center at 225 ± 10 cm−1 is present in the spectra of aliphatic primary amines with a primary α-carbon atom. On the basis of the deuterium shift this band is assigned to the amino torsion. The effects of branching at the α-carbon, coupling of methyl and amino torsions, and intramolecular association on the frequencies of NH2 torsions are discussed.

Keywords: Amines; Far infrared spectroscopy; Torsional vibrations

Document Type: Research Article


Affiliations: 1: Department of Chemistry, Miami University, Oxford, Ohio 45056; correspondence address: Dr. Stephen M. Craven, Miami University, c/o AFML/LPA, Wright-Patterson Air Force Base, Ohio 45433 2: Air Force Materials Laboratory (LPA), Wright-Patterson AFB, Ohio 45433

Publication date: July 1, 1972

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