Thermodynamic properties of mixtures containing 1-butyl-2,3-dimethylimidazolium tetrafluoroborate and cyclopentanone or cyclohexanone

Comparative Dielectric Study and Molecular Interactions of Binary Mixtures of (Cyclohexanone + 1-Alkanols) and (Cyclopentanone or Cyclohexanone + Cyclohexanol or Cyclohexane) atT= 298.15 K

“…The data presented here (Table 4) suggest that the g factors for the pure cyclic ketones are less than unity, suggesting a tendency for antiparallel molecular orientation through the dipole−dipole forces. The antiparallel self-association is mainly due to the overlapped dimers formed by carbonyl−carbonyl contacts, 33 which leads to the reduction of the effective dipole moment of the ketone molecules. A report along similar lines for the compound with the ring composed of five carbons has been previously reported in the literature, 34 where it has been concluded that pure cycloalkanone molecules with an odd number of carbon atoms, in particular, cyclopentanone molecules, exhibit a strong ability toward antiparallel dipole orientation.…”

“…These cyclic ketones are important organic chemicals, which have many uses in a variety of chemical, pharmaceutical, and plastics industries. − CPO and CHO are dipolar aprotic solvents which can act as hydrogen bond acceptors with the hydroxyl group of alcohols. On the basis of recent finding, the five- and six-membered cyclic ketones (CPO and CHO) display markedly different thermodynamic and associative behavior in the pure state as well as in solution. − The pure CPO molecules display a strong tendency for antiparallel dipole orientation. However, this tendency for CHO molecules to self-associate is weak …”

Viscosities of 1-Hexyl-3-methylimidazolium Tetrafluoroborate and Its Binary Mixtures with Dimethyl Sulfoxide and Acetonitrile

“…Ionic liquids have attracted a lot of attention in the last few years in both the academic world and industry. − Some of their key properties include negligible vapor pressure, excellent thermal stability, high solubility, and nonflammability. Another important feature is that a series of physicochemical properties such as the density, viscosity, and electrical conductivity can be tuned by adjusting the nature of the constituting ions or by mixing with suitable/appropriate cosolvents. − One of the main characteristics of some ionic liquids is their high viscosity, which could be considered to be an advantage for applications such as lubricants , but could be a disadvantage for applications which involve pumping, mixing, stirring, and heat-transfer operations. , …”

Dielectric, Volumetric, Refractometric, and Excess Properties of (Cycloalkanone + Pentanol Isomers) Systems at T = 298.15 K

“…The detailed material descriptions of the used chemicals are given in Table . The measured permittivities, refractive indices, and densities along with the reported data − ,− are listed in Table . The organic chemicals were dried with molecular sieves for at least 24 h before use.…”

“…Cyclopentanone (CPO) and cyclohexanone (CHO) are saturated five- and six-membered cyclic ketones having moderate to low permittivities and relatively large dipole moments of 3.27 and 3.03 debye, respectively. − The chemical structures of these symmetrical cyclic ketones are shown in Figure a. They are important industrial chemicals, which have many uses in a variety of chemical, pharmaceutical, biofuel, and plastics industries.…”