Ruthenium complexes with diazadienes. 4. Arene diazadiene ruthenium(II) complexes [(.eta.6-arene)(RN:CR':CR':NR)Ru(L)]n+ (n = 1, L = Cl, I, alkyl; n = 2, L = MeCN, .eta.2-C2H4) and arene diazadiene ruthenium(0)

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