Infrared and Raman spectra of N-n-alkylthioureas

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Abstract The i.r. and Raman spectra of solid alkyl thioureas H 2 NCSNH(CH 2 ) n CH 3 ( n = 0–15), TUR′, and their urea analogue H 2 NCONH(CH 2 ) n CH 3 ( n = 0–9), UR′, are presented. The vibrational properties of N -monosubstituted TUR′and UR′are studied on the basis of the spectral comparison between the members of the series and compared with the properties of N , N ′-di-substituted MTUR′ and MUR′, correspondingly. Some features of the methylene ν 4 and ν 7 band progressions were found to shift from the corresponding features of solid n -alkanes by vibrational coupling. The observed wavenumber of the longitudinal accordion-like skeletal motion (LAM-1) of TUR′ was found to correspond to that of the n -alkane with the same number of carbon atoms as TUR′ has skeletal atoms.

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