I would like to know the Dielectric constant of a mixture of two solvents. In order to optimize few systems in a particular dielectric constant to study the structural properties of few organic molecules, I want to know the process to calculate the dielectric constant of a mixture .
Ex. 1:1 of methanol and dichloromethane.
Can any one help with your valuable suggestions?
Thanks in advance.
Dear Ranga,
Attached is a paper covers the answer to your question.
I have copied the paper's title and abstract for your consideration:
International Journal of Pharmaceutics 269 (2004) 353–360
A simple relationship between dielectric constant of mixed
solvents with solvent composition and temperature
Abolghasem Jouyban a,b,∗, Shahla Soltanpour b, Hak-Kim Chan c
a School of Pharmacy, Tabriz University of Medical Sciences, Tabriz 51664, Iran b Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz 51664, Iran c Faculty of Pharmacy, The University of Sydney, Sydney NSW 2006, Australia
Received 31 May 2003; received in revised form 21 August 2003; accepted 12 September 2003
Abstract
A simple computational method for calculating dielectric constants of solvent mixtures based on Redlich-Kister extension was proposed. The model was applied to the experimental dielectric constant of binary and ternary solvent mixtures at fixed
and/or various temperatures and showed accurate results. Overall average percentage deviation (OAPD) between calculated and experimental dielectric constants was calculated as an accuracy criterion. The OAPDs for correlative and predictive analyses of dielectric constants in binary solvents at a fixed temperature were 0.56 and 1.42%, respectively. The corresponding values for binary solvents at different temperatures were 1.29 and 1.92%, respectively. The OAPDs for correlative and predictive analyses of dielectric constants of a nonaqueous ternary solvent mixture at various temperatures were 1.61 and 3.05%. The accuracy of
the proposed models has also been compared with those of previously published models and results showed that the proposed models were superior and capable of providing more accurate results.
Keywords: Dielectric constants; Mixed solvents; Mathematical model; Prediction
Hoping this will be helpful,
Rafik
Rafik's proposed solution requires a minimum number of dielectric constant data in the binary mixture of interest. If you have access to the data, go ahead and compute the model constants. Otherwise, if you have the data only in the mono-solvents, then look a paper published in J Chem Eng Data from my research group. Detail of the paper is:
Prediction of dielectric constants of binary solvents at various temperatures, Jouyban, A., Soltanpour, Sh., Journal of Chemical and Engineering Data, 55, 2951-2963, 2010
Good luck!
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