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Vibrational spectroscopic and theoretical studies of urea derivatives with biochemical interest: N,N’-dimethylurea, N,N,N’,N’-tetramethylurea and N,N’-dimethylpropyleneurea
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Chemical Research Center of the Hungarian Academy of Sciences, P.O. Box 77, H-1525, Budapest, Hungary.
Department of Chemistry, St. Petersburg State University, Universitetski pr., 26, 198504 St. Petersburg, Russia.
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2010 (English)In: Applied spectroscopy reviews (Softcover ed.), ISSN 0570-4928, E-ISSN 1520-569X, Vol. 45, 274-326 p.Article in journal (Refereed) Published
Abstract [en]

Mid-infrared, far-infrared and Raman vibrational spectroscopic studies were combined with DFT calculations and normal coordinate force field analyses for N,N’-dimethylurea (DMU), N,N,N’,N’-tetramethylurea (TMU) and N,N'-dimethylpropyleneurea (DMPU, IUPAC name 1,3-dimethyltetrahydropyrimidin-2(1H)-one). The equilibrium molecular geometry of DMU (all three conformers), TMU and DMPU, and the frequencies, intensities and depolarization ratios of their fundamental IR and Raman vibrational transitions were obtained by DFT calculations. The vibrational spectra were fully analysed by normal coordinate methods as well. A starting force field for DMPU was obtained by adapting corresponding force constants for DMU and TMU, resulting after refinements in the stretching force constants: C=O (7.69, 7.30, 7.68 N×cm -1), C-N (5.16, 5.55, 5.05 N×cm -1) and C-Me (5.93, 4.00, 4.22 N×cm-1) for DMU, TMU and DMPU, respectively. The dominating conformer of liquid DMU was identified as trans-trans, strong intermolecular hydrogen bonding was verified in solid DMU, and weak dipole-dipole association was found in liquid TMU and in DMPU. Special attention was paid to analysing the methyl group frequencies, which revealed deviations from local C3v symmetry. A linear correlation was found between the CH stretching force constants and the inverse of the CH bond lengths (1/r2). The averaged NH stretching frequencies of gaseous, dissolved and solid urea and of DMU, with variations for hydrogen bonding of different strength, are linearly correlated to the NH stretching force constants. Characteristic skeletal vibrations were assigned for a broad variety of urea derivatives and also for pyrimidine derivatives, which all contain the N2C=O entity. The very strong IR bands of C=O stretching (1676 ± 40 cm-1) and asymmetric CN2 stretching (1478 ± 60 cm-1), and the very intense Raman feature of symmetric CN2 stretching or ring breathing (757 ± 80 cm-1), can be recognized as fingerprint bands also for the pyrimidine derivatives cytosine, thymine and uracil, which all are nucleobases in DNA and RNA nucleotides.

Place, publisher, year, edition, pages
Taylor and Francis , 2010. Vol. 45, 274-326 p.
Keyword [en]
Vibrational spectra, theoretical calculations, equilibrium geometry, urea, N, N’-dimethylurea, N, N, N’, N’-tetramethylurea, N, N’-dimethylpropyleneurea, hydrogen bonding
National Category
Analytical Chemistry
Research subject
Structural Chemistry
Identifiers
URN: urn:nbn:se:su:diva-43077DOI: 10.1080/05704928.2010.483670ISI: 000278857200002OAI: oai:DiVA.org:su-43077DiVA: diva2:353510
Available from: 2010-09-27 Created: 2010-09-27 Last updated: 2017-12-12Bibliographically approved

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