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- W2038313293 abstract "The mid and far infrared and the Raman spectrum of 1,2-dibromopropane is reported in solid, liquid and gas. Several bands reported by earlier workers are not present in the spectrum of the purified material. Ab initio calculations of optimized geometry, energy, dipole moment, molar volume, vibrational spectrum and normal coordinate calculation were performed using the density functional B3LYP/6-311++g(3df,2pd), and the results used to assist a complete assignment of the 81 fundamental modes of vibrations of the three conformers of 1,2-dibromopropane. Relative energies found conformer A the lowest with G and G′ at 815.6 and 871.4 cm−1 higher. The temperature dependence of the Raman spectrum of the liquid was investigated in the CCC bending region and the relative energies determined. It was found that the G′ and G conformers lie 236 ± 11 and 327 ±11 cm−1, respectively above the A conformer, leading to the room temperature composition of the liquid as A, 65 ± 1; G′, 21 ± 1; G, 14 ± 1%. It is apparent that the calculated highest energy conformer G′ is stabilized more than the G conformer in the liquid. The G′ conformer has the lowest molar volume effectively changing the interaction distance between conformers in the liquid, and enhancing the effect of its dipole moment." @default.
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- W2038313293 date "2009-10-01" @default.
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- W2038313293 title "Vibrational spectrum, ab initio calculations, conformational stabilities and assignment of fundamentals of 1,2-dibromopropane" @default.
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- W2038313293 doi "https://doi.org/10.1016/j.saa.2009.08.015" @default.
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