U. Bentrup, ON THE THERMAL-DECOMPOSITION OF HYDRAZINIUMPENTAFLUOROMETALLATES N2H6MF5 OF IRON, VANADIUM AND ALUMINUM, Zeitschrift fur anorganische und allgemeine Chemie, 619(5), 1993, pp. 954-960
Citations number
13
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Zeitschrift fur anorganische und allgemeine Chemie
The thermal decomposition of the hydraziniumpentafluorometallates of N
2H6FeF5, N2H6VF5 and N2H6AlF5 has been investigated by thermoanalytica
l, X-ray and i.r. spectroscopic methods. The thermal decomposition lea
ds to ammonium compounds forming in consequence of disproportionation
of the hydrazinium cation into ammonia and nitrogen. Under quasi-isoba
ric conditions a multistage decomposition mechanism has been detected.
No hydrolysis reactions have been observed. In the iron system a part
ial reduction of Fe(III) takes place. Consequently NH4Fe2F6 is formed
which decomposes via (NH4)1-xFeF4-x (x = 0.6-0.8) with HTB-structure i
nto FeF3 and FeF2. In the aluminium and vanadium system the formation
of tetragonal (NH4F)y . MF3-phases (y = 0.2-0.8) as intermediates has
been observed. Final products of decomposition are VF3 and alpha-AlF3.