New iron tetrazolate frameworks: synthesis temperature effect, thermal behaviour, Mössbauer and magnetic studies

Vanessa Pimenta , Quang Hoang Hanh Le , Lucy Mary Clark, Jérôme Lhoste, Annie Hémon-Ribaud, Marc Leblanc, Jean-Marc Grenèche, Gilles Dujardin, Philip Lightfoot, Vincent Maisonneuve

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
2 Downloads (Pure)

Abstract

The exploration of the FeF3/FeF2-Hamtetraz-HF system in dimethylformamide by solvothermal synthesis evidences two isostructural 3D hybrid fluoroferrates. They are prepared from the same starting mixture at two different synthesis temperatures: 120 °C for [Hdma]·(Fe4IIFeIIIF8(H2O)2(amtetraz)4) (1) and 140 °C for [Hdma]1.5·(Fe4.5IIFe0.5IIIF7(H2O)(HCOO)(amtetraz)4) (2). Both compounds are characterized by single crystal X-ray diffraction, X-ray thermodiffraction, TGA analysis, Mössbauer spectrometry and SQUID magnetometry. They crystallize in the monoclinic system and are built from two distinct chains connected by aminotetrazolate anions. The first chain (FeIIFN4) is common to 1 and 2 and can be found in numerous fluorides. In the second chain (Fe3X12) (X = F, N, O), iron cations adopt both valence states Fe(II)/Fe(III). The hydrolysis of DMF implies the formation of a [Hdma]+ cation and a (HCOO) anion. The presence of Fe3+ in both phases is evidenced by 57Fe Mössbauer spectrometry. The magnetic properties are studied and two transitions from a paramagnetic regime to a long range ordered state below 30 K and 5 K are identified.

Original languageEnglish
Pages (from-to)7951-7959
JournalDalton Transactions
Volume44
Issue number17
Early online date19 Mar 2015
DOIs
Publication statusPublished - 7 May 2015

Keywords

  • Hybrid fluorides
  • Tetrazole
  • Dolvothermal synthesis
  • Magnetic properties

Fingerprint

Dive into the research topics of 'New iron tetrazolate frameworks: synthesis temperature effect, thermal behaviour, Mössbauer and magnetic studies'. Together they form a unique fingerprint.

Cite this