Determination of the Apparent Molar Refraction and Partial Molar Volume at Infinite Dilution of Thiophene-, Pyrrole- and Furan-2-Carboxaldehyde Phenylhydrazone Derivatives in Acetonitrile at 293.15 K |
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Authors: | Ysaías J. Alvarado José Caldera-Luzardo Gladys Ferrer-Amado Victoria Mancilla-Labarca Elba Michelena |
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Affiliation: | (1) Laboratorio de Electrónica Molecular (L.E.M), Departamento de Química, Facultad Experimental de Ciencias, La Universidad del Zulia (LUZ), Grano de Oro, Maracaibo, Estado Zulia, República Bolivariana de Venezuela |
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Abstract: | High-precision densitometry and high-accuracy refractometry measurements of extremely dilute solutions of the thiophene-2- (TCPH), pyrrole-2- (PCPH) and furan-2-carboxaldehyde-phenylhydrazone (FCPH) compounds in acetonitrile have been obtained at 293.15 K. The partial molar volumes V 2^∞ of each compound at infinite dilution were determined. The apparent molar refraction of these solutes at infinite dilution at 293.15 K has been experimentally determined within the Kohner-Geffcken-Grunwald-Haley approximation. The volumetric and refractometric results were interpreted in terms of the Pauling electronegativity and intrinsic molar volume of the heteroatom, and the aromaticity of the heterocyclic rings. The experimental results indicate that solute-solute interactions are negligible within the concentration range studied. Theoretical calculations at the DFT-B3LYP/6−311++G(3d,3p) level of molecular volumes support the interpretation that the volumetric contribution from the solute-solvent interactions to the limiting partial molar volumes of solutes are very small and thus solute molecules are isolated in this medium. |
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Keywords: | Phenylhydrazone derivatives Apparent molar refraction Intermolecular forces Limiting partial molar volume Pauling electronegativity |
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