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Structure and Vibrational Spectra of 1,3,5-Trimethoxybenzene

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Pawlukojć A., Bator G., Sobczyk L.
Acta Physica Polonica A
|
2007
|
vol. 112
|
issue S
S-171-S-181
EN
Inelastic neutron scattering infrared and Raman spectra of the crystalline 1,3,5-trimethoxybenzene were measured and compared with simulated ones by using the Gaussian 98 and DMol3 programs at density functional theory methods. Application of the double numerical plus polarization basis set for the crystalline state within the local density Perdew and Wang (PWC functionals) approximation quite well reproduces the low frequency bands related to the methyl group librational modes, which are very sensitive to molecular interactions. Infrared spectra for the crystalline sample and CCl_4 solution show spectacularly the change of low frequency modes by going from the symmetric D_{3h} molecules in the gas phase to asymmetric ones in the crystal.
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