US EPA

1000412 

Journal Article 

Molecular associations in binary mixtures of pyridine and chlorobenzene in benzene solution using microwave absorption data 

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

2007 

Yes 

Journal of Molecular Liquids
ISSN: 0167-7322 

130 

1-3 

70-73 

4 

English 

10.1016/j.molliq.2006.04.012 

WOS:000243616800013 

The dielectric relaxation time (tau) of binary mixtures of different molar concentrations of pyridine (C5H5N) and chlorobenzene (C6H5Cl) in benzene solution at different temperatures (25, 30, 35 and 40 degrees C) has been calculated by using standard microwave techniques and Gopala Krishna's single frequency (9.875 GHz) concentration variation method. The energy parameters (Delta H-epsilon, Delta F-epsilon, and Delta S-epsilon) for the dielectric relaxation process of the binary mixture containing 0.5 mol fraction of pyridine have been calculated at the respective temperatures. Comparisons have been made with the corresponding energy parameters for the viscous flow (Delta H-epsilon, Delta F-epsilon, and Delta S-epsilon). From the observations it is found that the dielectric relaxation process can be treated as the rate process. Based upon above studies, solute-solvent type of molecular associations arising from the interaction of chlorobenzene and benzene and pyridine and benzene molecules has been proposed. No solute-solute type of molecular association has been observed. (C) 2006 Elsevier B.V. All rights reserved. 

Dielectric relaxation;Binary mixture;Pyridine;Chlorobenzene 

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