8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

Fri 911:10-14:00P1.51Densities of the binary systemTrihexyltetradecylphosphonium Bromide + N,N-dimethylformamide from 293.15 to 313.15 K atatmospheric pressureAbel Zuñiga-Moreno, 1 Elizabeth Juarez-Camacho, 1 Carmen Reza, 1 MariaManriquez, 1 and Rosa de Lima Gutierrez-Lugo 21 Instituto Politecnico Nacional, Edif Z5, 2 Piso, UPALM, COL. Zacatenco 07738, Mexico,D. F. , Mexico2 ESIQIE-IPN, MEXICO, MexicoRoom Temperature Ionic Liquids (RTIL) are a new generation of solvents and offer numerousadvantages over molecular organic materials, particularly in their stability due to their negligiblevapour pressure. Other advantages include easy functionalization, large liquid ranges, and higheffective concentrations as compared to solutions. However, High viscosity could be their lessfavourable property. Perhaps, if RTILs can be used as mixed with other solvents to improve theirviscosities and favoured their flow. Termophysical properties on systems composed by RTILsare scarce in the literature and the number of papers has been increased with the years. In thiswork we report experimental densities on the system Trihexyltetradecylphosphonium Bromide +N, N-dimethylformamide from 293.15 to 313.15 K at atmospheric pressure. Measurements wereperformed with a densimeter from Anton Paar, model DMA 4500 M. The whole interval of compositionswas studied. Experimental densities were correlated using a polynomial expression andexcess molar volumes were calculated and correlated using a Redlich Kister expansion. TrihexyltetradecylphosphoniumBromide (CYPHOS R○IL 102) is liquid at room temperature or melts atT > 100 ◦ C, has high thermal stability, is immiscible with water, and soluble in organic solvents(however, when an excess of water is added to the system, three liquid phases are formed), is stableunder basic conditions, and mostly lighter than water, and it has lower costs compared with otherionic liquids.51