[Nb(η-C5R5)Cl4] with NMe(SiMe3)2 in acetonitrile. The sterically hindered alkyl- and aryl-imido analogues [Nb(η-C5H5)(NR)Cl2](R = But1c, or C6H3Pri2-2,6 1d), [Nb(η-C5Me5)(N-C6H3Pri2-2,6)Cl2]1e and the tantalum compound [Ta(η-C5Me5)(N-C6H3Pri2-2,6)Cl2]1f are obtained by treatment of [M(η-C5R5)Cl4] with two equivalents of NHR(SiMe3) in chlorocarbon solvent. Crystal structures of 1a, 1c, 1d and 1f show that these complexes
半夹心methylimido配合物[
铌(η-C 5 - [R 5)(NME)
氯2 ](R = H 1a中,或Me 1B)已经被制备治疗[
铌(η-C 5 - [R 5)
氯4 ]与NMe(SiMe 3)2在
乙腈中的溶液。空间位阻的烷基-和芳基-亚
氨基类似物[
铌(η-C 5 H ^ 5)(NR)
氯2 ](R =卜吨1c中,或C 6 H ^ 3
镨我2 -2,6 1D),[Nb的(η-C 5我5)(NC6 ħ 3
镨我2 -2,6)
氯2 ] 1E和
钽化合物[TA(η-C 5我5)(NC 6 H ^ 3
镨我2 -2,6)
氯2 ] 1F是通过处理而得到的[M(η-C 5 - [R 5)
氯4 ]与NHR两个当量(森3在
氯烃溶剂)。1a, 1c, 1d和1f的晶体结构表明这些配合物是单核的,具有准线性的亚
氨基
配体。
金属-氮键的距离范围为1.744(3)至1.780(5)Å,与伪三键一致。化合物1A - 1E与