Half-sandwich hydrazido(2-) complexes of niobium
Abstract
The compounds
[Nb(η-C
5
H
4
R)Cl
2
(NNMeR′)]
(R = H or Me, R′ = Me or Ph),
[Nb(η-C
5
H
4
R)(OBu
t
)
2
(NNMe
2
)] (R = H or Me),
[Nb(η-C
5
H
4
Me)Br(OBu
t
)(NNMe
2
)],
[Nb(η-C
5
H
5
)(NMe
2
)
2
(NNMe
2
)],
[Nb(η-C
5
H
4
R)(CH
2
CMe
2
Ph)
2
(NNMe
2
)] (R = H or Me),
[Nb(η-C
5
H
5
)(CH
2
SiMe
3
)
2
(NNMe
2
)],
cis-[Nb(η-C
5
H
5
)Cl
2
(NNMe
2
)],
cis-[Nb(η-C
5
H
4
R)Cl
2
(NNMe
2
)(PMe
3
)] (R = H or Me),
trans-[Nb(η-C
5
H
4
R)Cl(NNMe
2
)(PMe
3
)
2
]Cl (R = H or Me) and
trans-[Nb(η-C
5
H
5
)Cl(NNMe
2
)(PMe
3
)
2
][PF
6
] have been prepared and
characterised. A structure determination of
[Nb(η-C
5
H
5
)Cl
2
(NNMe
2
)]
showed it to be a dimer with one hydrazide ligand acting as monodentate
to one metal centre and a second hydrazide bridging both metal centres
in a µ-η
2
fashion. The structure of
[Nb(η-C
5
H
5
)Cl
2
(NNMe
2
)
{P(OMe)
3
}] shows a cis disposition of the
hydrazide and phosphite ligands.
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