Catalytic Reduction of Dinitrogen into Ammonia and Hydrazine Using Chromium Complexes Bearing PCP-Type Pincer Ligand

Abstract

A series of chromium–halide, –nitride, and –dinitrogen com-plexes bearing a carbene- and phosphine-based PCP-type pin-cer ligand is newly prepared and some of them are found to work as effective catalysts to reduce dinitrogen under atmos-pheric pressure, whereby up to 8.40 equiv of ammonia and 2.46 equiv of hydrazine (13.32 equiv of fixed N atom) are produced based on the chromium atom. To the best of our knowledge, this is the first successful example of chromium-catalyzed conversion of dinitrogen to ammonia and hydrazine under mild reaction conditions.

Ammonia from dinitrogen at ambient conditions by organometallic catalysts

“…28). 67 Recently, iron dinitrogen complexes were synthesized by this group to explore their activity towards nitrogen xation to get ammonia under mild conditions (Fig. 29).…”