期刊
FLUID PHASE EQUILIBRIA
卷 350, 期 -, 页码 43-50出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fluid.2013.03.001
关键词
Density; Heat capacity; Viscosity; Volumetric expansivity; Magnetic moment; Paramagnetism; Decomposition temperature
资金
- Fundacao para a Ciencia e Tecnologia (FCT), Portugal [PTDC/QUI/71331/2006, PTDC/CTM-NAN/121274/2010, PEst-OE/EQB/LA0004/2011, PEst-OE/QUI/UI0536/2011]
- FCT [SFRH/BPD/42035/2007, SFRH/BPD/34146/2006, SFRH/BD/39940/2007]
- EEA financial mechanism [PT0015]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/39940/2007, PTDC/QUI/71331/2006, SFRH/BPD/34146/2006, SFRH/BPD/42035/2007] Funding Source: FCT
The density, heat capacity and viscosity of two magnetic ionic liquids sharing the same Fe (III)-containing anion, specifically, [C(4)mim][FeCl4] and [P-66614][FeCl4], have been determined, along with their volumetric expansivity, and thermal decomposition temperatures. The magnetic properties of the two compounds have been studied using SQUID magnetometry. Both [C(4)mim][FeCl4] and [P-66614][FeCl4] are paramagnetic, but while in the first case the magnetic moment value is 5.8 mu(B)/Fe, therefore close to that of Fe3+, for the latter it is only 4.8 mu(B)/Fe. The effective concentration of magnetic sites is almost three times greater for [C(4)mim][FeCl4] as compared to [P-66614][FeCl4]. In this latter case, the experimental isothermal magnetization curves do not follow a Brillouin-type of behavior; alternatively, the results were discussed using the Spin Hamiltonian formalism in terms of both the, distortion of the Iron site and covalence effects. (C) 2013 Elsevier B.V. All rights reserved.
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