Formation of mononuclear nitrido complexes of chromium( VI ) and molybdenum( VI ); syntheses and X-ray crystal structures of NCr(OBu t ) 3 and NMo(OSiMe 3 ) 3 (py)

Mononuclear nitrido complexes of Cr and Mo, NCr(OBut)3 and NMo(OSiMe3)3(py), are synthesized; the chromium complex has an idealized C3ν symmetry while the molybdenum complex has a distorted square-pyramidal geometry with the nitrido ligand at apical position; the N–Cr distance is 1.538(5)Å while the average N–Mo distance is 1.627 Å.