Abstract
The niobium η-cyclopentadienyl compounds with imido and amido ligands [Nb(η-C5H5)(NtBu)(NHtBu)Cl] 1,* [Nb(η-C5H5)(NtBu)(NHtBu)nBu] 2, [Nb(η-C5H5)(NtBu)(NHtBu)2] 3, [Nb(η-C5H5)(NtBu)(NHtBu)Me] 4, [Nb(η-C5H5)(η1-C5H5)(NtBu)(NHtBu)] 5, [Nb{(η-C5H4)CMe2(η1-C5H4)}(NtBu)(NHtBu)] 6, [Nb(η-C5H5){N(C6H3iPr2-2,6)}(NHtBu)Cl] 7,* [Nb(η-C5H5){N(C6H3iPr2-2,6)}(NHtBu)Me] 8, [Nb(η-C5H5)(NtBu)(NEt2)Cl] 9 and [Nb(η-C5H5)(NtBu)(NHtBu)(NEt2)] 10 have been prepared (* indicates the crystal structure has been determined). A correlation between the chemical shift of the NH proton and the value of Δδ measured between the α and β carbons of the tert-butyl groups of the amido ligands is discussed in relation to the degree of electron donation from the amido ligand to the niobium centre.
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