Triggering N(2) uptake via redox-induced expulsion of coordinated NH(3) and N(2) silylation at trigonal bipyramidal iron.

Triggering N(2) uptake via redox-induced expulsion of coordinated NH(3) and N(2) silylation at trigonal bipyramidal iron.
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DOI:
10.1038/nchem.660
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发表时间:
2010-07
期刊:
影响因子:
21.8
通讯作者:
Peters, Jonas C.
Peters, Jonas C.
中科院分区:
化学1区
文献类型:
--
作者:
Lee, Yunho;Mankad, Neal P.;Peters, Jonas C.

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氮到氨的生物还原可以通过两种主要途径之一发生,其中可能涉及含氮NxHy中间体,包括肼(N2 H4)、二氮烯(N2 H2)、氮化物(N3-)和酰亚胺(NH 2-)。为了检验关于铁在逐步还原N2中的直接作用的假设的有效性,需要铁模型系统。这样的系统可以测试铁与各种提出的NxHy中间体的化学相容性,以及这些物质的反应模式。在这里,我们描述了TBP(SiPR 3)Fe-L支架(SiPR 3代表[Si(o-C6 H4 PR 2)3]-; R = Ph和iPr),其中顶端位置被含氮配体如N2、N2 H4、NH3和N2 R占据。该系统容纳三种形式氧化态(铁(0),+1和+2)的末端结合N2。N2吸收证明通过其还原伙伴NH3和N2 H4的位移,和N2 functionalizaton说明通过亲电硅烷化。
The biological reduction of nitrogen to ammonia may occur via one of two predominant pathways in which nitrogenous NxHy intermediates including hydrazine (N2H4), diazene (N2H2), nitride (N3-) and imide (NH2-) may be involved. To test the validity of hypotheses concerning iron’s direct role in the stepwise reduction of N2, iron model systems are needed. Such systems can test the chemical compatibility of iron with various proposed NxHy intermediates, and the reactivity patterns of such species. Here we describe a TBP (SiPR3)Fe-L scaffold (SiPR3 represents [Si(o-C6H4PR2)3]−; R = Ph and iPr) where the apical site is occupied by nitrogenous ligands such as N2, N2H4, NH3 and N2R. The system accommodates terminally bound N2 in the three formal oxidation states (iron(0), +1, and +2). N2 uptake is demonstrated via displacement of its reduction partners NH3 and N2H4, and N2 functionalizaton is illustrated via electrophilic silylation.
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