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Article Abstract
The vaporization enthalpies of [CTPP][Cu(F-acac)] ( = 14, 16) and [Cmim][Cu(F-acac)] ( = 8, 10), a new type of chelate-based ionic liquids (ChILs), were measured by thermogravimetric analysis (Δglom() = 73.2-83.7 kJ mol), which decreased compared to their non-chelate counterparts (difference up to 34.1 kJ mol). This can be explained by the fact that the increase in the polar region size by chelate ions mainly leads to the decrease in Coulomb forces based on the micro-biphasic separation in ionic liquids. Vaporization enthalpies at experimental temperatures were adjusted to a reference temperature by the Verevkin's method, and compared with the data calculated by the Kabo's method, which illustrated clear differences on ChILs. In addition, some physicochemical properties of [CTPP][Cu(F-acac)] ( = 14, 16) were measured including density, viscosity, conductivity, and surface tension.
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