Rhenium complexes with nitrogen ligands

Some platinum metals, especially ruthenium but also rhenium, osmium, and iridium, form luminescent complexes with nitrogen-containing ligands, e.g., 2,2 -bipyridine (bpy). These complexes may participate in redox reactions with concomitant chemiluminescence in three different ways. 

The rhenium(III) complexes with phosphine, isocyanide, and nitrogen ligands are molecular species, the metal atom being seven-coordinate. Solutions in nitrobenzene are non-conducting. The crystal structure of ReBr3(CN tol)4 and ReBr3(CO)2(bipy) are known. 

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