Abstract
Abstract In this short review, we discuss recent examples of well-defined metal complexes capable to split dinitrogen electrochemically. Large progress has been made in the chemical dinitrogen splitting with molecular complexes during the last couple of years; however, electrochemical N2 splitting remains scarce. Herein, three distinct examples, which were investigated in depth, are discussed. The iron complex 2+ converts N2 to ammonia via an associative mechanism. With the rhenium pincer complex 3, N2 is cleaved via a dissociative mechanism forming a very stable ReV-nitride complex. The aluminium complex 6 also converts N2 electrochemically to ammonia; however, the mechanism is distinctly different to that in 2+ or 3, as there is no evidence for a metal–N2 interaction and likely the ligand acts as a hydride donor.
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