Chemical Sciences Journal

Synthesis, Crystal Structure and Thermal Behaviour of a New Threedimensional Hybrid Fluoride Framework with Mixed Valence: (Fe2+/Fe3+)

Abstract

Mouna Smida, Jérôme Lhoste, Mohamed Dammak, Annie Hémon- Ribaud, Marc Leblan and Vincent Maisonneuve

Crystal structure of metal-organic frameworks (MOF’s) compound [Hdma]∙(Fe2+Fe3+F6(Hamtaz)2) was hydrothermally synthesized, eventually assisted via classical heating (Acid Digestion Autoclave). Crystalline structure determination is formed from single crystal X-ray diffraction data. The unit cell is orthorhombic space group Imma, with cell parameters a=15.9520(14) Å, b=9.4548(7) Å, c=9.7056(8) Å, V=1463.8(2) Å3 and Z=4. The structure [Hdma]∙(Fe2+Fe3+F6(Hamtaz)2) exhibits a three-dimensional inorganic network resulting from the association of FeIIFeIIIF6N4 planes with Hamtaz molecules in the [010] direction, as well as uncoordinated dimethylammonium cations [Hdma] which are formed by the hydrolysis of DMF solvent. The thermal analysis (TG) of the title compound shows that the decomposition undergoes two steps between 200°C and 600°C and the total experimental mass loss 63.03% assuming that the hematite Fe2O3, is the final product of the decomposition.