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Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Reduction of C 1 Substrates to Hydrocarbons by the Homometallic Precursor and Synthetic Mimic of the Nitrogenase Cofactor.
Journal of the American Chemical Society 2017 January 19
Solvent-extracted nitrogenase cofactors can reduce C1 substrates (CN- , CO and CO2 ) to hydrocarbons in reactions driven by a strong reductant, SmI2 (E0' = -1.55 V vs SCE). Here we show that a synthetic [Et4 N]4 [Fe6 S9 (SEt)2 ] cluster (designated the Fe6 RHH -cluster), which mimics the homometallic [Fe8 S9 C] core of the nitrogenase cofactor (designated the L-cluster), is capable of conversion of C1 substrates into hydrocarbons in the same reactions. Comparison of the yields and product profiles between these homometallic clusters and their heterometallic counterparts points to possible roles of the heterometal, interstitial carbide and belt sulfur-bridged iron atoms in catalysis. More importantly, the observation that a "simplified", homometallic cofactor mimic can perform Fischer-Tropsch-like hydrocarbon synthesis suggests future biotechnological adaptability of nitrogenase-based biomimetic compounds for recycling C1 substrates into useful chemical and fuel products.
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