The Study of Excess Refractive Indices of Benzene+Ethanol and Hexane+Ethanol Binary Systems

Abstract

In many technological processes, ethanol solvents and their mixtures are actively used to prepare nanostructured matrices, substrates and devices. A change in the concentration of one of the components leads to a change in the structure as a whole, affecting a number of quantities, such as the electrical conductivity of solutions, the diffusion coefficient, and the thermodynamics of processes, which is important to take into account when selecting optimal systems that use new nanomaterials with predetermined properties and characteristics for targeted preparation. The most informative method in the study of structural processes associated with the cluster formation of molecules is the method of refractometry. In this work, the refractive indices measured for binary system benzene+ethanol and hexane+ethanol at the 298.15K and the atmospheric pressure are reported. The refractive indices were measured over a wide range of benzene, hexane and ethanol concentrations (0÷1.0 mole fractions). It has been shown that hetero-molecular complexes in binary solutions are formed through π•••HO bonding at concentration of ~0.4 a mole fraction of benzene and through H-bonding at concentration of ~0.5 mole fraction of hexane. Relatively weak interactions are determined at concentration of ~0.2 and ~0.7 mole fraction of benzene.