Dielectric relaxation and libration spectroscopy of some aliphatic ketones and their molecular behavior

Terahertz spectroscopy of polar solute molecules in non-polar solvents

“…The librational motion is generally observed in the low frequency spectra, lower than 100 cm À1 , of neat liquids and liquid mixtures by OHD-RIKES [2,3]. Dielectric relaxation measurements of some aliphatic ketones in cyclohexane also observed librational component in the frequency region below 100 cm À1 in addition to the Debye relaxation component [10]. We also assign the component in the THz spectra observed for the polar solute to the librational motion of the solute molecule.…”

Molecular dynamics in crystalline acetone studied by dielectric spectroscopy and neutron diffraction

“…However, the variation of the heat capacity with temperature has been also associated with the strengthening of the characteristic electrostatic contacts of crystalline acetone. From the point of view of its dynamics, liquid and crystalline acetone have been studied by dielectric spectroscopy and nuclear magnetic resonance (NMR) both, in the pure state and as a guest in a host of different carboxylic acids [3,4]. In this respect, the rotational motion of the methyl group has been the subject of different studies [5,6].…”

Microwave and infrared dielectric relaxation of alkyl carbonates, chloroform, and their mixtures at 25.degree.C

“…The molecular interpretation of the observed phenomena, patterned after a previous work on ketone mixtures by Vij and Hufnagel,4 was proposed. This corresponded to rotational relaxation along the two axes of symmetry of the carbonate molecules, for the microwave region, and to molecular librations, for the IR region.…”