Details

Autor(en) / Beteiligte

• MacLeod, K Cory
• McWilliams, Sean F
• Mercado, Brandon Q
• Holland, Patrick L

Titel

Stepwise N-H Bond Formation From N 2 -Derived Iron Nitride, Imide and Amide Intermediates to Ammonia

Ist Teil von

• Chemical science (Cambridge), 2016, Vol.7 (9), p.5736-5746

Ort / Verlag

England

Erscheinungsjahr

2016

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Reduction of N to ammonia in nature and in electrocatalysis takes place through 1-proton/1-electron steps, motivating efforts to experimentally study the steps during proton/electron transfer to well-characterized N -derived species with bridging nitrides. We report here the protonation and reduction reactions of an N -derived iron bis(nitride) complex (Rodriguez , 2011, , 780). We isolate and definitively characterize triiron imido and amido intermediates that lie along the path to ammonia formation, and Mössbauer spectroscopy shows the oxidation level of iron atoms in these mixed-valence clusters. The first two H atoms add to one of the two nitrides of the bis(nitride) complex, and the proton-coupled electron transfer in the second step can be concerted or stepwise depending on the sources of protons and electrons. The characterization of partially protonated nitrides and their mechanisms of formation are expected to guide efforts to convert N to ammonia with mild acids.