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- W2001615864 abstract "Restricted Hartree-Fock and density function calculations (B3LYP), using 6-311++G(d,p), have been used to investigate the far infrared spectra of aromatic urethanes, synthesized on the basis of 2,4-and 2,6-toluene diisocyanate (2,4-TDI, 2,6-TDI), and the spectrum of ethylphenylurethane. It is shown, that the region of frequencies of 100-200 cm(-1) is associated primarily with torsional vibrations of methyl groups. For almost all studied urethanes, the bands are observed in the region 385-340 cm(-1), which is associated with in plane deformations of angles C-C-N-C, C-O-C and C-N-C of the urethane groups according to the calculations. The bands, observed at 300-320 and 260-280 cm(-1), are assigned to in plane and out of plane deformations of the urethane skeleton, which are mixed with vibrations of methyl group connected to the benzene ring." @default.
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- W2001615864 date "2008-11-01" @default.
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- W2001615864 title "Quantum chemistry studies of far-infrared spectra of aromatic urethanes" @default.
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- W2001615864 doi "https://doi.org/10.1016/j.saa.2007.12.009" @default.
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