Excess properties for acetylacetone + pentanols systems at 298.15 K

Abstract

From experimental densities, viscosities, and refractive indexes for the acetylacetone + I-pentanol, + 2-Pentanol, + isoamyl alcohol, and + tert-amyl alcohol systems at 298.15 K, the excess molar volumes, excess viscosities, excess molar free energies of activation of flow. and excess internal pressures were calculated over the whole concentration range. Conclusions about the rnolecular interactions in these mixtures were drawn from the variations of the excess functions with the composition. ROQUE RIGGIO, HECTOR E. MARTINEZ ct NORMA Z . DE SALAS. Can. J. Chem. 70, 2859 (1992).Utilisant les densites, les viscositCs et les indices de refractions experimentaux des systemes acCtylacCtone + pentan-1-01, + pentan-2-01, + alcool isoamylique et + alcool tert-amylique, ii 298,15 K , on a calculC les volumes molaires en exces, les viscositCs en excks, les energies libres d'activation molaires en exctts de I'Ccoulement et les pressions internes en exctts, pour l'ensemble des concentrations. En se basant sur les variations des fonctions en exctts en fonction de la composition, on a pu tirer des conclusions relativement aux interactions niolCculaires presentes dans ces melanges.[Traduit par la redaction]

Molar excess volumes of binary liquid mixtures: 2-pyrrolidinone with C6–C10n-alkanols

“…These averaged values are consistent with those reported using other types of functions (7). The fact that interactions between like molecules are stronger than between unlike molecules (25) explains why the positive contributions to excess volume depend on the alcohol chain length, but not on its dipole moment. Figure 4 shows the variation of a with the number of alkanol carbon atoms at different compositions of the mixtures.…”

Intradiffusion, Density, and Viscosity Studies in Binary Liquid Systems of Acetylacetone + Alkanols at 303.15 K

“…The V E values for AcAc + CH 3 OH are more negative than AcAc + C 2 H 5 OH, probably because methanol has a much stronger ability than ethanol to form the intermolecular hydrogen bonds between the unlike molecules (AcAc + alkanol), which produces a much more compact structure. Oppositely, the positive values in AcAc + 1-C 3 H 7 OH and AcAc + 1-C 4 H 9 OH show that interaction between like molecules overweighs interaction between unlike molecules . The V E values for AcAc + 1-C 3 H 7 OH is less positive than AcAc + 1-C 4 H 9 OH, probably because the self-association of alkanols in propanol may be more easily destroyed than in 1-butanol when AcAc is added.…”

“…Three types of interaction are illustrated when mixing AcAc and alkanols: (a) keto–enol, (b) keto–alkanol, and (c) enol–alkanol. We estimate in our work that in AcAc + 1-C 3 H 7 OH and AcAC + 1-C 4 H 9 OH, the keto–enol interaction gains far more predominant effects, while in AcAc + CH 3 OH and AcAc + C 2 H 5 OH, the above three interactions may simultaneously exist.…”

“…For this reason, acetylacetone and its derivatives have been the subject of experimental and theoretical studies − in which molecular structure, hydrogen bonding interaction, and keto–enol tautomeric equilibrium in pure liquid and solvents are extensively investigated using a large variety of different methods, including electron diffraction and X-ray diffraction measurements, IR, Raman, NMR spectroscopies, − quantum-chemical calculations, − and some other techniques. Besides, much work has been done with respect to excess properties of binary mixtures containing AcAc, which exhibits various situations when different substances possessing different polarity and molecular structure are added to AcAc. − …”

Modelling and experimental thermodynamic data of hydroxylic compounds (C1-C6) as a function of temperature

“…Riddick et al, 1986), (, DIPPR 2000), (,•••, Aralaguppi and Baragi, 2006), (▼, Resa et al, 2006), (, Goenaga et al, 2007). Ortega and Matos, 1986), (, Riddick et al, 1986), (▼, Riggio et al, 1992), (, DIPPR 2000), (▲,•••, Coquelet et al, 2007), (,•••, Goenaga et al, 2007), (, Ortega et al, 2008) Ali et al, 2005a), (, Ali et al, 2005b), (,--, Francesconi et al, 2005), (, Ali and Tariq, 2006), ( , Alonso-Tristan et al, 2012), (▼,--, Venkatramana et al, 2014) ( , Orge et al, 1997), , (, Zafarani-Moatar et al, 2006), (,•••, Kannappan et al, 2009), (▼,---, Singh et al, 2009), Aralaguppi and Baragi, 2006), (▼, Gonzalez et al, 2006a), (, Goenaga et al, 2007). Karunakar et al, 1982), (, Aralaguppi and Baragi, 2006), (▼, Gonzalez et al, 2006a), (, Kannappan et al, 2009), (▲ Karunakar et al, 1982), (, Gonzalez et al, 2002), (, Aralaguppi and Baragi, 2006), (, Zafarani-Moatar et al, 2006), (, Gonzalez et al, 2007), (, Bachu et al, 2008), (, Manukonda et al, 201...…”