@article{10902/24118,
year = {2021},
month = {6},
url = {http://hdl.handle.net/10902/24118},
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.},
organization = {Financial support from Universidad de Cantabria (Proyecto Puente convocatoria 2018 funded by SODERCAN_FEDER), Universidad del País Vasco/Euskal Herriko Unibertsitatea (GIU17/50 and PPG17/37) and
Ministerio de Economia y Competividad ((MAT2017-89239-C2-(1,2)-P PID2019-104050RAI00 and MAT2017-83631-C3-3-R). The authors also gratefully acknowledge technical and human support provided by
SGIKer (UPV/EHU, MINECO, GV/EJ, ERDF, and ESF). The manuscript is (partly) based on the results of experiments carried out at the ALBA Synchrotron Light Source, proposal 2017062253, in Barcelona and Institute Laue-Langevin (ILL) of Grenoble; proposals 5-12-341 (doi:https://doi.org/10.5291/ILL-DATA.5-12-341) and 5-31-2580 (https://doi.org/10.5291/ILL-DATA.5-31-2580).},
publisher = {Elsevier Science},
publisher = {Journal of Molecular Liquids, Volume 331, 1 June 2021, article 115716},
title = {Crystal and magnetic structure of the (trimim)[FeBr4] molten salt: a temperature dependence study},
author = {González Izquierdo, Palmerina and Fabelo Rosa, Óscar and Cañadillas-Delgado, Laura and Beobide Pacheco, Garikoitz and Cano, Israel and Vallcorba, Oriol and Rodríguez Fernández, Jesús and Fernández-Díaz, María Teresa and Pedro del Valle, Imanol de},
}