Synthesis and order–disorder transition in a novel metal formate framework of [(CH3)2NH2]Na0.5Fe0.5(HCOO)3]

Mirosław Mączka; Adam Pietraszko; Lucyna Macalik; Adam Sieradzki; Justyna Trzmiel; Adam Pikul

doi:10.1039/C4DT02586E

Synthesis and order–disorder transition in a novel metal formate framework of [(CH₃)₂NH₂]Na_0.5Fe_0.5(HCOO)₃]†

Mirosław Mączka,*^a Adam Pietraszko,^a Lucyna Macalik,^a Adam Sieradzki,^b Justyna Trzmiel^b and Adam Pikul^a

* Corresponding authors

^a Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Box 1410, 50-950 Wrocław 2, Poland
E-mail: m.maczka@int.pan.wroc.pl
Fax: +48-713441029
Tel: +48-713954161

^b Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

Abstract

We report the synthesis, crystal structure, thermal, dielectric, Raman, infrared, and magnetic properties of [(CH₃)₂NH₂][Na_0.5Fe_0.5(HCOO)₃] (DMNaFe), the first metal formate framework templated by organic cations, presenting an ABO₃ perovskite architecture with NaO₆ octahedra as building blocks of the framework. On the basis of Raman and IR data, assignment of the observed modes to respective vibrations of atoms is proposed. We have found that DMNaFe undergoes a structural phase transition at 167 K on cooling. According to the X-ray diffraction, the compound shows R [3 with combining macron] symmetry at 293 K and triclinic P [1 with combining macron] symmetry at 110 K. The DMA⁺ cations are dynamically disordered in the high-temperature phase and the phase transition is associated with ordering of the DMA⁺ cations and distortion of the metal formate framework. The dielectric studies reveal pronounced dielectric dispersion that can be attributed to slow dynamics of the DMA⁺ cations. Based on the low-temperature magnetic studies, this compound is a weak ferromagnet with a critical temperature 8.5 K.

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Article information

DOI: https://doi.org/10.1039/C4DT02586E
Article type: Paper
Submitted: 26 Aug 2014
Accepted: 18 Sep 2014
First published: 19 Sep 2014

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Dalton Trans., 2014,43, 17075-17084

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Synthesis and order–disorder transition in a novel metal formate framework of [(CH₃)₂NH₂]Na_0.5Fe_0.5(HCOO)₃]

M. Mączka, A. Pietraszko, L. Macalik, A. Sieradzki, J. Trzmiel and A. Pikul, Dalton Trans., 2014, 43, 17075 DOI: 10.1039/C4DT02586E

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