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Sandeep Kumar, D.R. Sharma, Nagesh Thakur, N.S Negi, V. S. Rangra

Molecular Associations in Binary Mixture of Pyridine and Nitrobenzene in Benzene Solution using Microwave Absorption Data

Keywords: Dielectric Relaxation, Binary Mixture, Pyridine, Nitrobenzene

The dielectric relaxation time (τ) of binary mixtures of different molar concentrations of pyridine (C₅H₅N) and nitrobenzene (C₆H₅NO₂) in benzene solution has been calculated by using standard microwave techniques and Gopala Krishna’s single frequency (9.875 GHz) concentration variational method at different temperatures (25, 30, 35 and 40 °C). It is found that the dielectric relaxation time (τ) varies non-linearly with the increasing molar concentration of pyridine in the binary mixture of pyridine and nitrobenzene. Dielectric relaxation has been found to be an activated process. Energy parameters (ΔH_ε, ΔF_ε, ΔS_ε) for this activated process have been calculated and compared with the parameters (ΔH_η, ΔF_η, ΔS_η) of viscous flow process. Based upon above results solute–solvent and solute–solute molecular associations have been proposed.

Zeitschrift für Physikalische Chemie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0942-9352
Volume: 219, 12/2005
Pages: 1649 - 1654

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