SCHEDULED MAINTENANCE
Preparation and characterisation of dimolybdenum complexes containing fluorophenylimide ligands
Abstract
The arylimido complexes
[Mo
2
O
2
(µ-NR)(µ-O)(η
5
-C
5
H
4
Me)
2
] and
[{MoO(µ-NR)(η
5
-C
5
H
4
Me)}
2
] (R = C
6
H
4
F-2 or
C
6
H
4
CF
3
-2) were obtained from the reaction
between
[{Mo(η
5
-C
5
H
4
Me)(CO)
3
}
2
] and the appropriate nitrobenzene RNO
2
. In
contrast, the corresponding reaction between
O
2
NC
6
H
3
F
2
-2,6 and
[{Mo(η
5
-C
5
H
4
Me)(CO)
3
}
2
] generated two isomeric bis(imido) complexes
[{MoO(µ-NC
6
H
3
F
2
-2,6)(η
5
-C
5
H
4
Me)}
2
], which were
separated by column chromatography. Hydrogen-1 and
19
F NMR
spectroscopic studies suggested that
[{MoO(µ-NC
6
H
4
CF
3
-2)(η
5
-C
5
H
4
Me)}
2
] exists in two
chemically inseparable isomeric forms. The molecular structures of
[Mo
2
O
2
(µ-NC
6
H
4
F-2)(µ-O)(
η
5
-C
5
H
4
Me)
2
],
[Mo
2
O
2
(µ-NC
6
H
4
CF
3
-2)(µ-O)(η
5
-C
5
H
4
Me)
2
] and the centrosymmetric isomer of
[{MoO(µ-NC
6
H
4
CF
3
-2)(η
5
-C
5
H
4
Me)}
2
] have been
determined by single-crystal X-ray diffraction. In each structure the
central Mo
2
(µ-O)(µ-NR) or
Mo
2
(µ-NR)
2
core is planar with a trans
configuration of methylcyclopentadienyl ligands and a substantial
twist angle between the phenyl rings and the metallacycle planes.
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