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Reaction of [Fe(N-Et-HPTB)(CHCOS)](BF) (1) with (NO)(BF) produces a nonheme mononitrosyl diiron(II) complex, [Fe(N-Et-HPTB)(NO)(DMF)](BF) (2). Complex 2 is the first example of a [Fe{Fe(NO)}] species and is also the first example of a mononitrosyl diiron(II) complex that mediates the reduction of NO to NO. This work describes the selective synthesis, detailed characterization and NO reduction activity of 2 and thus provides new insights regarding the mechanism of flavodiiron nitric oxide reductases.

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Desulfurization of organosulfur compounds is a highly important reaction because of its relevance to the hydrodesulfurization (HDS) process of fossil fuels. A reaction system involving Co(BF)·6HO and the dinucleating ligands HBPMP or HPhBIMP has been developed that could desulfurize a large number of thiophenes, sulfides, and thiols to generate the complexes [Co(BPMP)(μ-SH)(MeCN)](BF) (1a), [Co(BPMP)(SH)](BF) (1b), and [Co(PhBIMP)(μ-SH)(X)](BF) [X = DMF (2a), MeCN (2c)], while the substrates are mostly converted to the corresponding alcohols/phenols. This convenient desulfurization process has been demonstrated for 25 substrates in 6 different solvents at room temperature.