Polarized components of C=O vibrations Raman spectra for ethylacetate, acetone, and aggregation of molecules
Annotatsiya
For liquid ethylacetate the frequency maximums for parallel (I<sub>||</sub> (v)) and perpendicular (I<sub>&highmod;</sub>(v)) polarized components of C=O vibrations band in Raman spectra are differed on 5.3 cm<sup>-1</sup>. At dilution ethylacetate in CCl<sub>4</sub> and heptane or heating in this difference is decreased by displacement of I<sub>||</sub> (v) maximum to the I<sub>&highmod;</sub>(v) maximum. In polar solvent, nitrometane, the picture is different - the frequency maxima difference is decreased though the displacement of I<sub>&highmod;</sub>(v) band maximum to the I<sub>||</sub> (v)one. The results were explained by the complexity of C=O vibration bands, and existence within the band of two lines with the different depolarization ratio. The complexity of the band is the result existence in liquid ethylacetate the monomer molecules and molecular aggregations.
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