Direct NO Reduction by a Biomimetic Iron(II) Pyrazolate MOF.

A novel metal-organic framework (MOF) containing one-dimensional, Fe ²⁺ chains bridged by dipyrazolate linkers and N,N-dimethylformamide (DMF) ligands has been synthesized. The unusual chain-type metal nodes feature accessible coordination sites on adjacent metal centers, resulting in motifs that are reminiscent of the active sites in non-heme diiron enzymes. The MOF facilitates direct reduction of nitric oxide (NO), producing nearly quantitative yields of nitrous oxide (N ₂ O) and emulating the reactivity of flavodiiron nitric oxide reductases (FNORs). The ferrous form of the MOF can be regenerated via a synthetic cycle involving reduction with cobaltocene (CoCp ₂ ) followed by reaction with trimethylsilyl triflate (TMSOTf).
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