Infrared spectra of the n-butyl and n-pentyl radicals

The n-butyl (CH3CH2CH2CH2), n-butyl-1,1-d2 (CH3CH2CH2CD2), n-pentyl (CH3CH2CH2CH2CH2), and n-pentyl-1,1-d2 (CH3CH2CH2CH2CD2) radicals have been generated in argon matrices by UV irradiation of the corresponding diacyl peroxides. The infrared spectra of the radicals reveal that the vibrational modes may be separated into two parts: the first consists of a number of modes characteristic for the primary radical center; the second consists of those vibrations of the nonradical portion of the chain which appear to be similar to those found for closed-shell hydrocarbons. © 1983 American Chemical Society.