Niobium η-cyclopentadienyl compounds with imido and amido ligands derived from tert-butylamine
作者:Martin J. Humphries、Malcolm L. H. Green、Michael A. Leech、Vernon C. Gibson、Matthew Jolly、David N. Williams、Mark R. J. Elsegood、William Clegg
DOI:10.1039/b006333i
日期:——
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 Îδ 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.
铌η-环戊二烯化合物与亚胺和氨基配体[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 和 [Nb(η-C5H5)(NtBu)(NHtBu)(NEt2)] 10 已被制备(*表示晶体结构已确定)。关于氨基配体向铌中心提供电子的程度,讨论了氨基配体叔丁基的α和β碳之间测得的Δδ值与NH质子的化学位移之间的相关性。