Niobium(IV) fluoride is a chemical compound with the
formula
In science, a formula is a concise way of expressing information symbolically, as in a mathematical formula or a ''chemical formula''. The informal use of the term ''formula'' in science refers to the general construct of a relationship betwee ...
. It is a nonvolatile black
solid
Solid is one of the State of matter#Four fundamental states, four fundamental states of matter (the others being liquid, gas, and Plasma (physics), plasma). The molecules in a solid are closely packed together and contain the least amount o ...
.
Properties
absorbs vapor strongly and turns into in moist air. It reacts with water to form a brown solution and a brown precipitate whose components are unknown. It is stable between 275 °C and 325 °C when heated in a vacuum. However, it disproportionates at 350 °C rapidly to form
niobium(V) fluoride and
niobium(III) fluoride:
: (at 350 °C)
Structure
Niobium(IV) fluoride adopts a crystal structure analogous to that of
tin(IV) fluoride
Tin(IV) fluoride is a chemical compound of tin and fluorine with the chemical formula SnF4 and is a white solid with a melting point above 700 °C.
SnF4 can be prepared by the reaction of tin metal with fluorine gas:
:Sn + 2F2 → SnF4
Howev ...
, in which each niobium atom is surrounded by six fluorine atoms forming an octahedron. Of the six fluorine atoms surrounding a single niobium atom, four are bridging to adjacent octahedra, leading to a structure of octahedra connected in layers.
[
]
References
{{Fluorine compounds
Niobium(IV) compounds
Fluorides
Metal halides