Density, Viscosity, Electrical Conductivity, and Surface Tension of Chelate-Based Ionic Liquids [C₁₀mim][M(hfac)₃] (M = Co, Ni, Cu) at Different Temperatures

Abstract

Densities, viscosities, electrical conductivities, surface tensions, and melting points of chelate-based ionic liquids [C10mim]­[M­(hfac)3] (M = CoII, NiII, CuII; hfac = hexafluoroacetylacetonate; C10mim = imidazolium cation with C10 chain) were measured. Densities and viscosities were measured in the temperature range (328.15–343.15) K, and electrical conductivities and surface tensions were measured in the temperature range (323.15–343.15) K. By means of Glasser’s theory, the standard molar entropy and crystal energy were estimated. The molar enthalpy of vaporization was calculated by Kabo’s method, and the ionicity was evaluated by the Walden rule. The effects of different metals on the properties of ionic liquids were compared, and it was found that different metals have great influence on the transport properties of ionic liquids but little influence on thermodynamic properties.

Magnetic Ionic Liquids: Current Achievements and Future Perspectives with a Focus on Computational Approaches

“…As expected, MILs based on Dy(III) and Gd(III) anions exhibited high magnetic susceptibility, a characteristic inherent to rare earth metals. 21 Lu et al 89 utilized 1-decyl-3-methylimidazolium hexafluoroacetylacetonate chelated metal anions ([C 10 C 1 im][M(hfac) 3 ], where M = Co(II), Ni(II), and Cu(II)) to incorporate divalent metals into the anions. The melting points of the resulting MILs ranged from 311 to 318 K, and their densities at 328.15 K varied from 1.374 to 1.395 g cm −3 .…”

Ionic Liquid‐Based Stimuli‐Responsive Functional Materials

“…Thermochromic behavior was also demonstrated by many transition-metal complexes such as copper, [106] halide complexes, [106] nickel, [107] and lanthanide complexes, [108][109][110][111] due to the energy alternation of the d-d transitions and configuration changes between transition metal and appropriate donor. 2− formed after a thermally induced dehydration process, the ILs exhibited reversible thermochromism behavior (transparent to blue or vice versa).…”

“…Thermochromic behavior was also demonstrated by many transition‐metal complexes such as copper, [ 106 ] halide complexes, [ 106 ] nickel, [ 107 ] and lanthanide complexes, [ 108–111 ] due to the energy alternation of the d‐d transitions and configuration changes between transition metal and appropriate donor. The thermochromic properties of ionic liquid bis(1‐butyl‐3‐methylimidazolium) tetrachloronickelate ([Bmim] 2 [NiCl 4 ]) have been demonstrated.…”

Carbon dioxide capture by new DBU‐based DES: The relationship between ionicity and absorptive capacity

“…Some researchers have noticed a fact that the molecular state and ionic state coexist in a DES system. Although obviously, ionicity cannot be ignored, most studies only consider its correlation with physical properties of ILs 39‐41 . The effect of their co‐existence on absorption mechanism and the relationship between ionicity and absorption amount are worth discussing.…”