Fluoroferrate templated with HAmTAZ: X-ray single crystal, thermal behaviour, vibrational study and magnetic characterization

A new metal–organic compound FeF6(HAmTAZ)3 which (HAmTAZ = 3-amino-1,2,4-triazole) was hydrothermally synthesized from an equimolar mixture of FeF2 and FeF3 with HAmTAZ, aqueous HF and ethanol solvent at 410 K yielded a new hybrid class I fluoroferrate. The structure was characterized by single-crystal X-ray diffraction data. The crystal structure of FeF6(HAmTAZ)3 crystallizes in the trigonal system space group R3c with a = b = 12.5230 (6) Å, c = 18.5950 (16) Å, γ = 120° and Z = 6. The structure was built up from isolated octahedral FeF6 separated by [HAmTAZ]+ cations. The thermal analysis has shown that the decomposition undergoes two steps between 475 and 775 K. IR and mass spectrometry have been used to confirm the presence of the organic molecule in the crystal lattice and determine the evacuated vapours during the decomposition, respectively. The magnetization of the title compound has no revealed any ferromagnetic component in the range of magnetic field from −20 to 20 KOe at room temperature.This research work is supported by the Tunisian Ministry of Higher Education and Research and the Spanish MINECO (MAT2006-150AM).Peer Reviewe