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Crystal and magnetic structure of the (trimim)[FeBr4] molten salt: a temperature dependence study

Abstract: A new imidazolium-based halometallate complex with formula (trimim)[FeBr4] (trimim: 1,2,3- trimethylimidazolium) has been synthesized and characterized as a function of the temperature. The structural phase transitions, magnetic properties and magnetic structure of this compound have been thoroughly studied. The crystal structure evolution from 1.8 to 400 K has been investigated by a combination of synchrotron X-ray and neutron powder diffraction, as well as single crystal X-ray and neutron diffraction. Four different phases were found: phase I, from 400 to 350 K, with the orthorhombic Cmc21 space group; phase II, from 350 to 160 K,whichwasmodelledwith themonoclinic P21/mspace group; and phase III, stable down to 13 K and showing the monoclinic Cm space group. The transition from phase III to II involves the appearance of disorder in the organic cations.Magnetometry measurements indicate a long-range magnetic order below13 K, whichwas confirmed by single crystal and powder neutron X-ray diffraction analyses. The occurrence of new reflections that were not possible to index with the phase III unit cell suggests a symmetry breaking, giving rise to the phase IV. A joint refinement (single-crystal and powder data) revealed that the latter phase exhibits the magnetic Shubnikov Ccc space group. Thismodel consists of a strictly antiferromagnetic structure with ferromagnetic interactions within the unit cell, which is compatible with the magnetometry results.

 Autoría: González-Izquierdo P., Fabelo O., Cañadillas-Delgado L., Beobide G., Cano I., Vallcorba O., Fernández J.R., Fernández-Díaz M.T., de Pedro I.,

 Fuente: Journal of Molecular Liquids, 2021, 331, 115716

 Editorial: Elsevier Science

 Fecha de publicación: 01/06/2021

 Nº de páginas: 10

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.molliq.2021.115716

 ISSN: 1873-3166,0167-7322

 Proyecto español: MAT2017-89239-C2-(1,2)-P ; PID2019-104050RAI00

 Url de la publicación: https://doi.org/10.1016/j.molliq.2021.115716

Autoría

PALMERINA GONZALEZ IZQUIERDO

FABELO, OSCAR

CAÑADILLAS-DELGADO, LAURA

BEOBIDE, GARIKOITZ

CANO, ISRAEL

VALLCORBA, ORIOL

FERNÁNDEZ-DÍAZ, MARÍA TERESA