Niobium(IV) fluoride

Niobium(IV) fluoride
IUPAC name Niobium(IV) fluoride
Identifiers
CAS number	13842-88-1 Y
Properties
Molecular formula	NbF4
Molar mass	168.9 g/mol
Appearance	black solid
Melting point	350 °C(decompose)
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Niobium(IV) fluoride is a chemical compound with the formula NbF₄; it is a nonvolatile black solid. It absorbs vapor strongly. It turns into NbO₂F in moist air. NbF₄ reacts with water strongly to form brown solution and brown precipitate whose components are unknown. It is stable between 275℃ and 325℃ when heating NbF₄ in vacuum. However, it takes disproportionating reaction over 350℃ rapidly to form niobium(V) fluoride and niobium(III) fluoride:

$\mathrm{\ 2 NbF_4 \rightarrow NbF_5 + NbF_3}$(at 350℃)^[1]

References

1. ^ 张青莲 (1981). 无机化学丛书. Beijing: Science Press. pp. 323. ISBN 7-03-002238-6.