Chemistry Reference
In-Depth Information
Figure 5.11
Structure of [Ti
11
3
-
O
13
-OPr
i
7
OPr
i
6
OEt
5
](
ž
D
3
-oxo, D Ti; H atoms omitted).
Figure 5.12
Structure of [Ti
12
3
-
O
14
-O
2
-OPr
i
4
OPr
i
12
](
ž
D
3
-oxo, D Ti; H atoms omitted).
structure is capped by five TiO moieties which lie above five of the six square faces
of the T
d
-distorted cuboctahedron. As shown in Fig. 5.13 all seventeen of the terminal
positions are occupied by
tert
-butoxo ligands and the single hydrogen atom is present
in the
-OH group and is hydrogen bonded to the lattice Bu
t
OH molecule.
At the centre of the Ti
18
O
45
framework is a tetrahedral Ti atom which is linked
by four
4
-oxo ligands to four groups of three TiO
6
octahedra (Keggin structure).
