![]() ![]() All purified organic liquids were stored in brown glass bottles and fractionally distilled just before use. This difference was attributed to a low contamination level of n-hexane solvent used in the DFM purification process. The percentage carbon and hydrogen content of DFM were each slightly higher, while that for oxygen was lower than the expected values. The elemental analysis of DFM was found to be as follows: Calcd for C 9H 8O 2: C, 72.96 H, 5.44 O, 21.60. DFM was prepared as described elsewhere, and its purity was confirmed by 1H-NMR and density measurements. Each of (C 5 - C 8 ) n-alkanes was purified by distillation using 1 m fractionation column fitted with glass beads. Materials and Purification of Solvents The following chemicals were used: n-pentane (Fluka, analytical reagent ≥ 99.8%), n-hexane (Merck Co., ≥ 98.0%), n- heptane (Merck Co., ≥ 99.0%), n-octane (Saarchem chemicals, 99.0%), furfuryl alcohol (Merck Co., 98.0%), borontrifluoride-dietherate, BF 3(OEt 2) 2, (Sigma-Aldrich Chemicals Co., 99.0%). A survey of the literature has indicated that there has been no reported study on volumetric properties for (DFM + n-pentane or n-hexane or n-heptane or n-octane) binary mixtures at ( T = 293.15, 298.15 and 303.15) K. The results obtained have been used to interpret intermolecular interactions that exist in these binary mixtures. The data of the binary mixtures have been fitted to the Redlich – Kister equation to allow determination of the fitting parameters. We herewith report densities, ρ, excess molar volumes, and excess partial molar volumes, for (DFM + n-pentane or n-hexane or n-heptane or n-octane) binary mixtures at ( T = 293.15, 298.15 and 303.15) K and atmospheric pressure. The objective of the present study is to obtain information on intermolecular interactions in the binary mixtures of DFM with n-pentane or n-hexane or n-heptane or n-octane. In addition, thermodynamic evidence obtained from Depolarized Raleigh Scattering studies on pure n-alkanes, indicates that there is short range orientational order between chains of molecules in the pure state which increases with the carbon chain length. On the other hand for pure n-alkanes, the intermolecular interactions in part comprise of van der Waals forces. It has been reported that DFM comprise of polar molecules and its liquid structure is determined by the dipole-dipole interactions. Studies of thermodynamic properties such as excess molar volumes contribute to understanding the nature of molecular interactions in liquid mixtures. Introduction Research activities in our laboratory consist of systematic measurements of physicochemical properties of non-aqueous binary mixtures in which difuryl methane (DFM) is one of the two components. Keep container tightly closed.ġ Strongly contaminated halogen-free organic solvents: container A.1. P403 + P233: Store in a well-ventilated place. P303 + P361 + P353: IF ON SKIN (or hair): Take off immediately all contaminated clothing. P301 + P310: IF SWALLOWED: Immediately call a POISON CENTER/doctor. P210: Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. P202: Do not handle until all safety precautions have been read and understood. H411: Toxic to aquatic life with long lasting effects. H373: May cause damage to organs through prolonged or repeated exposure if inhaled. H304: May be fatal if swallowed and enters airways. H225: Highly flammable liquid and vapour. We declare our EMSURE® range to be in compliance with the ACS, with the reagent part of the European Pharmacopoeia (Reag. EMSURE® provides worldwide best and most extensive product specifications. EMSURE® grade solvents are suitable for a broad spectrum of classical lab applications, and are frequently used in regulated and highly demanding lab applications. ![]()
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