Faculté des sciences

Synthesis, structure and electrochemistry of cationic diruthenium complexes of the type [(N∩N)2Ru2 (CO)2 (μ-CO)2(μ-OOCFc)]+ containing a ferrocenecarboxylato bridge and two chelating aromatic diimine ligands

Auzias, Mathieu ; Therrien, Bruno ; Süss-Fink, Georg ; Štěpnička, Petr ; Ludvík, Jiří

In: Journal of Organometallic Chemistry, 2007, vol. 692, no. 4, p. 755-760

The dinuclear bis(ferrocenecarboxylato) complex Ru2 (CO)4 (μ-OOCFc)2 (py)2 (Fc = ferrocenyl, py = pyridine) was found to react with aromatic diimines (2,2′-dipyridyl, 4,4′-dimethyl-2,2′-dipyridyl, 1,10-phenanthroline, 5-nitro-1,10-phenanthroline, and 5-amino-1,10-phenanthroline) in methanol to give the cationic diruthenium complexes... Plus

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    Summary
    The dinuclear bis(ferrocenecarboxylato) complex Ru2 (CO)4 (μ-OOCFc)2 (py)2 (Fc = ferrocenyl, py = pyridine) was found to react with aromatic diimines (2,2′-dipyridyl, 4,4′-dimethyl-2,2′-dipyridyl, 1,10-phenanthroline, 5-nitro-1,10-phenanthroline, and 5-amino-1,10-phenanthroline) in methanol to give the cationic diruthenium complexes [(N∩N)2Ru2 (CO)2 (μ-CO)2(μ-OOCFc)]+ (1: N∩N = 2,2′-dipyridyl, 2: N∩N = 4,4′-dimethyl-2,2′-dipyridyl, 3: N∩N = 1,10-phenanthroline, 4: N∩N = 5-nitro-1,10-phenanthroline, 5: N∩N = 5-amino-1,10-phenanthroline), which have been isolated as the hexafluorophosphate salts. The molecular structure of 3, solved by single-crystal X-ray analysis of the tetraphenylborate salt [3][BPh4], shows a diruthenium backbone bridged by two carbonyl and by one ferrocenecarboxylato ligand, the two 1,10-phenanthroline ligands being in the axial positions. Cyclic voltammetry in dichloromethane reveals for all compounds two successive oxidations due to ferrocene/ferrocenium redox couple and oxidation of the diruthenium core.