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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