Hydrothermal synthesis, thermal decomposition and optical properties of Fe2F5(H2O)(Htaz)(taz)(Hdma)

Crystal structure of Fe2F5(H2O)(Htaz)(taz)(Hdma) which crystallizes in the triclinic sys-tem space group P1 with unit cell parametersa= 8.8392(5) A ̊,b= 9.1948(5) A ̊,c= 9.5877(5) A ̊,a= 82.070(3)°,b= 63.699(3)°,c= 89.202(3)°,Z= 2, andV= 690.91(7) A ̊3, was synthesizedunder hydrothermal conditions at 393 K for 72 h, by a mixture of FeF2/FeF3, 1,2,4-triazole mole-cule (Htaz), and hydrofluoric acid solution (HF 4%) in dimethylformamide solvent (DMF). Themain feature of this material is the coexistence of two oxidation states for iron atoms (Fe2+,Fe3+) in the unit cell, which associate by opposite fluorine corners of FeF5N and FeF2N4octahe-dra, and/or triazole molecule which originates the 2D produces material. The structure determina-tion, performed from single crystal X-ray diffraction data, lead to theR1/WR2reliability factors0.031/0.087. Thermal stability studies (TG/DTG/DTA) show that the decomposition provides inthe temperature range 473–773 K and no mass loss was detected before 473 K. Mass spectrometry(MS) has been used. The optical absorption of the solid was measured at the correspondingkmaxusing UV–vis diffuse-reflectance spectrum.This work was supported by the minister of superior educationand research of Tunisia and Spanish MINECO (MAT2013-40950R

Hydrothermal synthesis, thermal decomposition and optical properties of Fe2F5(H2O)(Htaz)(taz)(Hdma)

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