ansa-η-Cyclopentadienylimide derivatives of
niobium
Abstract
Treatment of the ansa-bridged η-cyclopentadienylimide
compound
[Nb{η
5
,κN-C
5
H
4
(CH
2
)
3
N}Cl
2
] 1 with MgMeBr gave
the binuclear ansa-bridged η-cyclopentadienylimide
derivative
[MeNb{µ-C
5
H
4
(CH
2
)
3
N}{µ-NCH(CH
2
)
2
C
5
H
4
}NbMe
2
] 2. The crystal structure of
2 has been determined. Detailed
1
H and
13
C NMR
studies showed that 2 undergoes an interesting fluxional process
involving interchange of two methyl groups under an ansa arch.
Reaction of 1 with Na(C
5
H
5
) gave
[Nb{η
5
,κN-C
5
H
4
(CH
2
)
3
N}(η
5
-C
5
H
5
)(η
1
-C
5
H
5
)] 3, which is
also fluxional and undergoes diverse dynamic processes including
exchange between η
1
- and
η
5
-cyclopentadienyl rings. The compounds
[Nb{η
5
,κN-C
5
H
4
(CH
2
)
3
N}(CH
2
Ph)
2
] and
[Nb{η
5
,κN-C
5
H
4
(CH
2
)
3
N}{CH
2
C(Me)CH
2
}
2
] have also been prepared.
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