Homobinuclear complexes of osmium(IV) with nitrogen-containing π-conjugated bridging units

The synthesis as well as chemical and physical properties of anionic homobinuclear osmium(IV) complexes of the general type [AsPh4]2[OsCl5(LL)OsCl5] [LL =  pyrazine (6), 4,4′-bipyridine (7), 1,4-dicyanobenzene (8) and 4-cyanopyridine (9)] is described. While 6 and 9 exhibit strong (6) or weak (9) intramolecular electronic communication between the Os(IV) centres, in 7 and 8 the metals can be considered non-interacting.

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