Dielectric characterisation and intermolecular interactions in propionitrile-dimethyl sulphoxide mixtures using a time domain reflectometry.

Complex permittivity spectra of propionitrile (PN) – dimethyl sulphoxide (DMSO) mixtures in the 10 MHz–30 GHz frequency range were investigated using time-domain reflectometry (TDR). The Debye model was employed to fit the measured dielectric spectra, allowing for the calculation of dielectric parameters like the static dielectric constant (<italic>ε</italic><italic>0</italic>) and relaxation time (<italic>τ</italic>). Excess dielectric constant (<italic>ε</italic><italic>0</italic> <italic>E</italic>) and excess inverse relaxation time <italic>(1/τ)</italic><italic>E</italic> were subsequently calculated from the measured <italic>ε</italic><italic>0</italic> and <italic>τ</italic>. The observed variations in these excess parameters provide evidence for intermolecular interactions within the PN-DMSO mixtures. Theoretical estimates of the <italic>ε</italic><italic>0</italic> were obtained using Luzar’s hydrogen-bonded model. [ABSTRACT FROM AUTHOR]