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Tetrafluoroborate
Tetrafluoroborate
is the
anion
BF
4
-
. This tetrahedral species is
isoelectronic
with
tetrafluoromethane
, CF
4
and
tetrafluoroammonium
NF
4
+
, and is valence
isoelectronic
with many stable and important species including the closely related anion
perchlorate
, ClO
4
-
. It arises by the reaction of fluoride salts with the
Lewis acid
BF
3
, treatment of
tetrafluoroboric acid
with base, or by treatment of
boric acid
with
hydrofluoric acid
.
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