P. González-Izquierdo, O. Fabelo, Imanol de Pedro del Valle
Aug 14, 2021
Citations
0
Influential Citations
0
Citations
Journal
Acta Crystallographica Section A Foundations and Advances
Abstract
The synthesis of multifunctional materials is a hot focus of research in materials science. In this respect, the synthesis of complexes based on the combination of organic-inorganic building blocks provides a promising approach in the design of systems with tuneable properties. In this communication we will present the properties of a new compound based on quinuclidine as the organic cation and FeCl 4 as the inorganic anion, with the formula (quinuclidine)[FeCl 4 ]. Similar compounds derived of this heterocyclic cation have been found to present interesting ferroelectric properties.[1] In this context, the multifunctional behaviour of this novel molecular crystal is related to the electronic structure of the 3d 5 configuration of the Fe(III) ions together with the ability of the counter-ions to change of orientation or even become disordered as a function of temperature. The structural characterization of (quinuclidine)[FeCl 4 ] compound shows two phase transitions. The first one, detected in the range from 100 to 300 K, was resolved by single-crystal X-Ray and neutron diffraction. At 300 K, the compound presents the orthorhombic space group Pbc 2 1 . At 100 K, the space group is Pbca , with a doubling of the a- axis, related to the rotation of the cations: two different orientations of the counterion are observed in the low temperature