Chemistry Reference
In-Depth Information
Figure 4.28
Structure of
[Ce
OBu
t
2
NO
3
2
Bu
t
OH
2
]
(H atoms omitted).
Figure 4.29
Structure of [Ce
2
f
-
OC
2
H
4
N
Me
C
2
H
4
NMe
2
g
2
OPr
i
6
]
(H atoms omitted).
(av. 2
.
322 A
vs
2
.
041 A) and more acute CeOC angles (av. 140
Ž
vs
173
.
5
Ž
). Although
[Ce(OBu
t
2
OCBu
t
3
2
] was unstable the Ce(
III
) compound [Ce
2
-OBu
t
2
OCBu
t
3
4
]
was isolated and characterized.
123
The molecule has the familiar pseudo-tetrahedral
bridged structure with the less bulky
tert
-butoxo ligands taking the bridging
positions (data in Table 4.7). The use of the aminoalcohol Me
2
NC
2
H
4
N(Me)C
2
H
4
OH
gave rise to the centrosymmetric dimer [Ce
2
f
-OC
2
H
4
N(Me)C
2
H
4
NMe
2
g
2
OPr
i
6
]
in
which
all
the
isopropoxo
ligands
occupy
terminal
positions
and
the
tridentate
functionalized
alkoxo
group
acted
as
a
bridging
chelating
ligand
giving seven-coordinated Ce(
IV
) (Fig. 4.29).
124
The novel eight-coordinated Ce(
IV
)
