Chemistry Reference
In-Depth Information
O
State 1
A
l
O
Al
O
O
if donor present isolable
side
reaction
OO
D
Al
O
O
F
3
species present in isopropoxide fluoride
sols with a ratio F: Al lower 1…
O
O
O
Al
F
F
A
l
O*
O
O
Al
A
l
O
O
Al
O
F
F
F
O
*O
OO
O
Al
OO
F
Al
F
O*
Al
O
F
Al
O
F
F
F
O
O
O
O
F
Al
O
*O
Al
O
O
*
F
F
F
O
F
F
F
1
2
- O*
F
F
Al
F
O
F
F
…and in the
corresponding solids.
F
The loss of solvent leads to
formation of AlF
4
species
along with un converted
Al(OiPr)
3
1
and cross-linked
AlF
x
(O
i
Pr)
6-x
species.
O*
O
F
Al
F
O
*
O
Al
F
O*
t
F
F
F
F
F
F
Al
F
F
Scheme 1.4 Derived mechanism for the beginning sol-gel fluorination process with low
fluorine supply (O*:
iPrOH; O: -O-iPr).
(Reproduced from [34] by permission of
the
American Chemical Society.)
State 2
O
Al
O
Al
F
F
F
F
F
*O
F
F
O
Al
solid:
wet sol:
F
Al
F
F
F
F
F
Al
O
F
Al
F
F
*O
*O
F
O
*
*O
F
F
F
F
F
F
F
Al
F
F
F
F
F
F
O
F
Al
*O
F
F
F
F
O
*
F
Al
F
F
F
O
F
F
- O*
F
F
F
Al
F
F
F
F
O
O
*
Al
F
F
Al
F
F
O
F
O
O
*
Al
F
O
*
F
F
Al
F
F
F
irregular
solid
F
F
O
*
O
Al
F
F
F
O*
O
Al
F
F
F
F
F
F
O
*
O
Al
F
O*
F
F
F
F
O
minor ?
A
l
O
Al
O
and further
O
OO
O*
Al
indications for
formationof a similar
compound like
3
O
O
F
3`
(D = O*)
Scheme 1.5 Derived mechanism for a progressive fluorination degree (reproduced from [34]
by permission of the American Chemical Society)
