Issue 6, 2016

Structural, magnetic and dielectric properties of two novel mixed-valence iron(ii)–iron(iii) metal formate frameworks

Abstract

Two novel mixed-valence iron(II)–iron(III) formate frameworks templated by ethylammonium and diethylammonium cations have been prepared and characterized by DSC, X-ray diffraction and spectroscopic methods. We also report dielectric and magnetic properties of the obtained samples. Both MOFs crystallize in the P[3 with combining macron]1c structure and exhibit magnetic order at 39 K. The analogue with diethylammonium cations undergoes a structural phase transition near 240 K into a triclinic phase. This transition has an order–disorder character and it is associated with pronounced dielectric anomaly. This compound is therefore the second discovered mixed-valence metal formate exhibiting multiferroic properties.

Graphical abstract: Structural, magnetic and dielectric properties of two novel mixed-valence iron(ii)–iron(iii) metal formate frameworks

Supplementary files

Article information

Article type
Paper
Submitted
06 Nov 2015
Accepted
04 Jan 2016
First published
05 Jan 2016

J. Mater. Chem. C, 2016,4, 1186-1193

Author version available

Structural, magnetic and dielectric properties of two novel mixed-valence iron(II)–iron(III) metal formate frameworks

M. Mączka, A. Ciupa, A. Gągor, A. Sieradzki, A. Pikul and M. Ptak, J. Mater. Chem. C, 2016, 4, 1186 DOI: 10.1039/C5TC03683F

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