期刊
NATURE CHEMISTRY
卷 2, 期 7, 页码 558-565出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.660
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资金
- National Institutes of Health [GM-070757]
- National Science Foundation (NSF) [CHE-0234877]
The biological reduction of N-2 to give NH3 may occur by one of two predominant pathways in which nitrogenous NxHy intermediates, including hydrazine (N2H4), diazene (N2H2), nitride (N-3(-)) and imide (NH2-), may be involved. To test the validity of hypotheses on iron's direct role in the stepwise reduction of N-2, model systems for iron 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 trigonal bipyramidal Si(o-C6H4PR2)(3)Fe-L scaffold (R = Ph or i-Pr) in which the apical site is occupied by nitrogenous ligands such as N-2, N-2 H-4, NH3 and N2R. The system accommodates terminally bound N-2 in the three formal oxidation states (iron(0), +1 and +2). N-2 uptake is demonstrated by the displacement of its reduction partners NH3 and N2H4, and N-2 functionalizaton is illustrated by electrophilic silylation.
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