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Lantsuzskaya E.V.,Voronezh State University | Krisilov A.V.,Biryuch Innovation Center | Levina A.M.,Biryuch Innovation Center
Russian Journal of Physical Chemistry A | Year: 2015

Ion mobility spectra were recorded for linear aliphatic ketones with three to nine carbon atoms. Two most intense peaks were found to be the peaks of the monomer and dimer and used to calculate the reduced ion mobilities and the scattering (collision) cross sections (by the Mason-Schamp equation). The scattering cross sections increased linearly with the molecular mass. Based on the results of experiments and quantum-chemical calculations, it was concluded that the formation of the acetone dimer is accompanied by a decrease in the dipole moment of the structure relative to that of the monomer. For higher ketones, there is no compensation of the dipole moment. © 2015 Pleiades Publishing, Ltd. Source


Lantsuzskaya E.V.,Voronezh State University | Krisilov A.V.,Biryuch Innovation Center | Levina A.M.,Biryuch Innovation Center
Russian Journal of Physical Chemistry A | Year: 2015

Abstract Ion-mobility spectra of a set of aliphatic linear aldehydes with the number of carbon atoms from 3 to 7 are obtained. Values of the mobility corresponding to two most intense peaks, considered to be those of a monomer and dimer, are determined according the spectra. Based on mobility, collision cross sections are calculated using the Mason-Schamp equation. The linear increase in the collision cross sections upon an increase in molecular weight is determined. According to the experimental results, the contribution to the cross section that has no dependence on molecular weight diminishes with the formation of dimers. It is established using quantum chemical calculations that this is associated with a reduction in the dipole moment upon the formation of dimers. © 2015 Pleiades Publishing, Ltd. Source

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