RT info:eu-repo/semantics/article
T1 Orientational Effects and Random Mixing in 1-Alkanol + Alkanone Mixtures
A1 González López, Juan Antonio
A1 Mediavilla Trabada, Ángela
A1 García de la Fuente, Isaías
A1 Cobos, José Carlos .
A1 Alonso Tristán, Cristina
A1 Riesco, Nicolás
K1 Electrical engineering
K1 Electrotecnia
AB 1-Alkanol + alkanone systems have been investigated through the data analysis of molar excess functions,enthalpies, isobaric heat capacities, volumes and entropies, and using the Flory model and the formalism of the concentrationconcentrationstructure factor (SCC(0)). The enthalpy of the hydroxyl-carbonyl interactions has been evaluated. Theseinteractions are stronger in mixtures with shorter alcohols (methanol-1-butanol) and 2-propanone or 2-butanone. However,effects related to the self-association of alcohols and to solvation between unlike molecules are of minor importance whencompared with those which arise from dipolar interactions. Physical interactions are more relevant in mixtures with longer1-alkanols. The studied systems are characterized by large structural effects. The variation of the molar excess enthalpy with thealcohol size along systems with a given ketone or with the alkanone size in solutions with a given alcohol are discussed in terms ofthe different contributions to this excess function. Mixtures with methanol show rather large orientational effects. The randommixing hypothesis is attained to a large extent for mixtures with 1-alkanols ≠ methanol and 2-alkanones. Steric effects andcyclization lead to stronger orientational effects in mixtures with 3-pentanone, 4-heptanone, or cyclohexanone. The increase oftemperature weakens orientational effects. Results from SCC(0) calculations show that homocoordination is predominant andsupport conclusions obtained from the Flory model.
PB American Chemical Society
SN 0888-5885
YR 2013
FD 2013-07
LK http://hdl.handle.net/10259/4697
UL http://hdl.handle.net/10259/4697
LA eng
NO Ministerio de Ciencia e Innovación, under ProjectFIS2010-16957.
DS Repositorio Institucional de la Universidad de Burgos
RD 04-dic-2024