Thermophysical Properties of 1-Propyronitrile-3-alkylimidazolium Bromide Ionic Liquids at Temperatures from (293.15 to 353.15) K

Ziyada, Abobakr K.; Wilfred, Cecilia Devi; Bustam, Mohammad Azmi; Man, Zakaria; Murugesan, Thanapalan

doi:10.1021/je901050v

Cited by 59 publications

(139 citation statements)

References 34 publications

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“…The obtained values are in reasonable agreement with the expected ones estimated by summing the cholinium cation (93.1 cm 3 ·mol -1 ) 48 and the AA molar volumes 58 measured in solution by 65 other authors. Our experimental data were higher of less than 12%, which is reasonably because the excluded volume was not considered in the calculation.…”

Section: Density Measurementssupporting

confidence: 90%

“…44 50 sulfur atom should not be much greater than about 20 % with respect to that of a methylene group while the molecular weight of sulfur is about 128 % higher than that of a methylene group, 46 the presence of sulfur could give an important contribution to the overall density of the ILs. Using the values of the van der Waals 55 volume of free amino acids in solutions, 4748 65 with respect to that formed by the classical hydroxyl group, 25 does not seem to give a significant contribution to the density values. It is worthwhile to compare our densities with those obtained for other AA based ILs.…”

Section: Density Measurementsmentioning

confidence: 98%

“…The semilogarithmic plot is slightly curved which means that the [Ch][AA] ILs do not display an Arrhenius temperature behaviour. 65 Rather, the significant feature of glassy or supercooled liquids is observed. On approaching the glass transition temperature, there is a further increase.…”

Section: Viscosity Measurementsmentioning

confidence: 99%

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Cholinium-amino acid based ionic liquids: a new method of synthesis and physico-chemical characterization

Santis

Masci

Casciotta

et al. 2015

Phys. Chem. Chem. Phys.

145

130

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In the present work we report the synthesis and physico-chemical characterization in terms of the viscosity and density of a wide series of cholinium-amino acid based room temperature ionic liquids ([Ch][AA] RTILs). 18 different amino acids were used to obtain 14 room temperature ILs. Among the most common AAs, only valine did not form an RTIL but it is a liquid above 80 °C. With respect to the methods reported in the literature we propose a synthesis based on potentiometric titration which has several advantages such as shorter preparation time, stoichiometry within ±1%, very high yields (close to 100%), high reproducibility, and no use of organic solvents, thus being more environmentally friendly. We tried to prepare dianionic ILs with some AAs with two potentially ionisable groups but in all cases the salts were solids at room temperature. All the ILs were characterized by (1)H NMR to confirm the stoichiometry. Physico-chemical properties such as density, viscosity, refractive index and conductivity were measured as a function of temperature and correlated with empirical equations. The values were compared with the data already reported in the literature for some [Ch][AA] ILs. The thermal expansion coefficient αp and the molar volume Vm were also calculated from the experimental density values. Due to the high number of AAs explored and their structural heterogeneity we have been able to find some interesting correlations between the data obtained and the structural features of the AAs in terms of the alkyl chain length, hydrogen bonding ability, stacking and cyclization. Some parameters were also found to be in good agreement with those reported for other ILs. We think that these data can give an important contribution to the understanding of the structure-property relationship of ILs because they focused on the structural effect of the anions, while most data in the literature are focussed on the cations.

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Section: Density Measurementssupporting

confidence: 90%

Section: Density Measurementsmentioning

confidence: 98%

See 1 more Smart Citation

Cholinium-amino acid based ionic liquids: a new method of synthesis and physico-chemical characterization

Santis

Masci

Casciotta

et al. 2015

Phys. Chem. Chem. Phys.

145

130

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“…The instrument was calibrated with Millipore-grade water using ILs with data previously established by our research group [12][13][14]. The viscosities and densities of the ILs were measured in the temperature range of 293.15-373.15 K with ±0.01 K accuracy and uncertainties of 0.5 % and ±5 9 10 -4 gÁcm -3 , respectively.…”

Section: Viscosity and Densitymentioning

confidence: 99%

“…Results showed that incorporation of more alkyl groups or increasing the length of the alkyl group chain on the imidazolium cation caused increases in the refractive index, which may be due to increases in electron density on the alkyl group. Increases in electron density have been suggested to increase the refractive indices of ILs [12]. 4 ].…”

Section: Refractive Indexmentioning

confidence: 99%

Synthesis and Thermophysical Properties of Hydrogensulfate Based Acidic Ionic Liquids

et al. 2015

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Three ionic liquids (ILs): 1-butyl-3-methyl-imidazolium hydrogensulfate [C 4 C 1 Im] [HSO 4 ], 1-butyl-imidazolium hydrogensulfate [C 4 C 0 Im][HSO 4 ], and 1-methylimidazolium hydrogensulfate [C 1 C 0 Im][HSO 4 ], were synthesized and characterized. The effect of alky group incorporation into the imidazolium cation was evaluated in terms of changes in density, surface tension, viscosity, and thermal degradation of the ILs. The viscosity and density were measured within the temperature range of 293.15-373.15 K, and experimental values of density were used to calculate molar volume, standard molar entropy, lattice energy, and thermal expansion coefficients. Glasser's approach was used to calculate the lattice energies of the ILs. Surface tensions in the temperature range of 293.15-353.15 K were also measured and surface tension values were used to estimate the surface entropy and enthalpy of the ILs. Refractive indices were measured with an ATAGO refractometer (RX-5000a) within the temperature range of 293.15-323.15 K. Thermal gravimetric analysis was performed in the temperature range of 323.15-773.15 K.

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Linking Diffusion–Viscosity Decoupling and Jump Dynamics in a Hydroxyl‐Functionalized Ionic Liquid: Realization of Microheterogeneous Nature of the Medium

Das¹,

Majhi

Sahu

et al. 2016

ChemPhysChem

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Analysis of time-resolved fluorescence anisotropy data in light of the Stokes-Einstein-Debye hydrodynamic description reveals significant decoupling of rotational motion of the solute and the viscosity of the medium for a hydroxyl-functionalized ionic liquid (IL). This behavior and NMR experiments indicate that the hydroxyl-functionalized IL is more heterogeneous than other structurally similar ILs. Considering that recent theoretical investigations have demonstrated that the jump dynamics and hydrogen-bond fluctuations are closely related in viscous media, in such a case the hydrodynamic description can provide inconsistent results, and the present inapplicability of the hydrodynamics description in explaining solute rotation in a viscous hydroxyl-functionalized IL perhaps provides experimental support to the role of orientational jumps and hydrogen bond formation in that event.

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Thermophysical Properties of 1-Propyronitrile-3-alkylimidazolium Bromide Ionic Liquids at Temperatures from (293.15 to 353.15) K

Cited by 59 publications

References 34 publications

Cholinium-amino acid based ionic liquids: a new method of synthesis and physico-chemical characterization

Cholinium-amino acid based ionic liquids: a new method of synthesis and physico-chemical characterization

Synthesis and Thermophysical Properties of Hydrogensulfate Based Acidic Ionic Liquids

Linking Diffusion–Viscosity Decoupling and Jump Dynamics in a Hydroxyl‐Functionalized Ionic Liquid: Realization of Microheterogeneous Nature of the Medium

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