[μ‐N₂H₂{Ru(PPh₃)dttd}₂], the First Diazene Complex with Sulfur‐Coordinated Transition Metal Centers (dttd = 2,3,8,9‐Dibenzo‐1,4,7,10‐ tetrathiadecane(2 –))

The complex 2, in which trans ‐N 2 H 2 bridges two ruthenium centers , could, as illustrated below, be obtained from the hydrazine complex 1. 2 forms blackish‐green crystals with 2 CH 2 Cl 2 . Complexed diazene, such as is present in 2 , is probably the key compound in the reduction of N 2 at the iron and/or molybdenum centers of nitrogenases. equation image