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Review of 'Dielectric properties of liquid systems: study of interactions in the systems carbon tetrachloride with benzene, toluene, and p-xylene'

Overall the article is well written and can be accepted if the minor points are addressed.
Average rating:
    Rated 4 of 5.
Level of importance:
    Rated 3 of 5.
Level of validity:
    Rated 4 of 5.
Level of completeness:
    Rated 4 of 5.
Level of comprehensibility:
    Rated 4 of 5.
Competing interests:

Reviewed article

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Dielectric properties of liquid systems: study of interactions in the systems carbon tetrachloride with benzene, toluene, and p-xylene

Abstract Intermolecular associations in liquid systems of non-polar and slightly polar compounds were studied through excess molar volumes (VME), and excess dielectric properties (εE and nD2E) for mixtures of carbon tetrachloride (CCl4) with benzene (C6H6), toluene (C6H5CH3), and p-xylene (p−(CH3)2C6H4). These excess properties were calculated from measurements of density (ρ), static permittivity (ε), and refractive index (nD) over the whole range of concentrations, at 298.15 K. The values of the excess dielectric properties for these mixtures were fitted in two different ways, one through least squares using the Redlich–Kister equation and the other using a model developed to explain deviations from ideality. The first fit was found to be descriptive while the second gave the equilibrium constant values for the interaction products actually formed in the mixtures and the respective electronic polarizabilities and dipole moments, indicating the existence of interaction products.

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    Review text

    In the current article intermolecular reaction of mixture of carbon tetrachloride with three other liquids is studied using dielectric excess (difference of the measurement result from static permittivity of ideal mixture) as a measure. These measured values have been fitted using two methods: a least square parametric model and a model based on the deviation from the ideality.
    The article is well written and can be accepted, but some important points have to be elaborated.

    Referring to Fig.9, authors claim that "There it can be seen that when the existence of the complexes CCl4:C6H6 and CCl4:2C6H6 is considered in the solution, the experimental values fit within errors by the model. In the same figure, the curve is shown when only the complex CCl4:C6H6 is considered. Therefore, it may be said that existence of the complex CCl4:2C6H6 is distinct possibility that should be confirmed by experimental measurements of other properties". "It should also be mentioned that the relative errors in the parameters are all larger than in the case wherein the existence of a CCl4:C6H6 complex is considered."

    Can authors comment in more detail on the above specific issue and elaborate their explanation. And they have not mentioned what is the estimated error and chi-square, R-square or any such parameters so as to claim which one of the two is better.


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