Synthesis and reactivity of cyclometalated triamidophosphine complexes of niobium and tantalum.

Synthesis and reactivity of cyclometalated triamidophosphine complexes of niobium and tantalum.
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铌钽环金属化三酰胺膦配合物的合成及反应活性

DOI:
10.1021/acs.inorgchem.5b00333
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发表时间:
2015
影响因子:
4.6
通讯作者:
J. Ballmann
J. Ballmann
中科院分区:
化学2区
文献类型:
--
作者:
M. Sietzen;H. Wadepohl;J. Ballmann

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三酰胺膦质子配体1与铌和钽的均配五(二甲基酰胺基)前体[M(NMe 2)5,其中M = Nb,Ta]反应形成[N2 PCN-κ5-N,N,P,C,N]M(NMe 2)(2-M)型环化配合物。除了三个酰胺基供体,配体骨架的一个苄基位置在该反应过程中被去质子化,导致形成新的M-C键。因此,形成金属氮丙啶亚结构,并且三酰胺基膦部分因此充当四阴离子五齿配体。二甲基酰胺配合物2-M可以通过用三乙基甲硅烷基三氟甲磺酸酯(Et 3SiO 3SCF 3)和(三甲基甲硅烷基)甲基锂(LiCH 2SiMe 3)处理而转化为相应的三氟甲磺酸酯[N2 PCN-κ 5-N,N,P,C,N] M(OTf)(3-M)和烷基配合物[N2 PCN-κ 5-N,N,P,C,N]M(CH 2SiMe 3)(4-M)。烷基配合物表现出有趣的反应活性,包括第二环化骨架活化,得到三甲基膦稳定的配合物[NP(CN)2-κ6-N,P,C,N,C,N]M(PMe 3)(5-M)。在钽的情况下,在4-Ta氢化时观察到形成双核双配位络合物(6)。在铌的情况下,4-Nbis中的金属氮丙啶亚结构倾向于通过与三苯基硅胺(Ph 3SiNH 2)的质子化开环,导致形成相应的酰亚胺络合物[PN 3-κ4-P,N,N,N]Nb <$NSiPh3(7)。
The triamidophosphine protioligand1reacts with the homoleptic pentakis(dimethylamido) precursors of niobium and tantalum [M(NMe2)5, where M = Nb, Ta] to form cyclometalated complexes of the type [N2PCN-κ5-N,N,P,C,N]M(NMe2) (2-M). Apart from the three amido donors, one benzylic position of the ligand backbone is deprotonated over the course of this reaction, resulting in the formation of a new M–C bond. As a consequence, a metallaziridine substructure is formed, and the triamidophosphine moiety thus serves as a tetraanionic pentadentate ligand. The dimethylamido complexes2-Mcan be converted into the corresponding triflates [N2PCN-κ5-N,N,P,C,N]M(OTf) (3-M) and alkyl complexes [N2PCN-κ5-N,N,P,C,N]M(CH2SiMe3) (4-M) by treatment with triethylsilyl triflate (Et3SiO3SCF3) followed by (trimethylsilyl)methyllithium (LiCH2SiMe3). The alkyl complexes exhibit interesting reactivities, including a second cyclometalative backbone activation affording the trimethylphosphine-stabilized complexes [NP(CN)2-κ6-N,P,C,N,C,N]M(PMe3) (5-M). In the case of tantalum, the formation of a dinuclear hydrido complex (6) is observed upon hydrogenation of4-Ta. In the case of niobium, the metallaziridine substructure in4-Nbis prone to ring opening via protonation with triphenylsilylamine (Ph3SiNH2), resulting in formation of the corresponding imido complex [PN3-κ4-P,N,N,N]NbNSiPh3(7).
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