Dinuclear hexamethylbenzene ruthenium cations containing ?1:?2-2-(ferrocenyl)ethen-1-yl ligands: Synthesis, structure, electrochemistry
Tschan, Mathieu J. L.
Date de parution
J. Organomet. Chem.
De la page
A la page
The cationic ferrocenyl-contg. complexes [(?6-C6Me6)2Ru2(?-?1:?2-CH-CHFc)2(?-H)]+ (3) and [(?6-C6Me6)2Ru2(?-PPh2)(?-?1:?2-CH-CHFc)(?-H)]+ (4) were synthesized in EtOH from ethynylferrocene and the dinuclear precursors [(?6-C6Me6)2Ru2(?-H)3]+ (1) and [(?6-C6Me6)2Ru2(?-PPh2)(?-H)2]+ (2), resp., and isolated as tetrafluoroborate salts. The spectroscopic data of 3 and 4 as well as the single-crystal x-ray diffraction anal. of [BF4] show that the alkyne function of ethynylferrocene was converted to a ?/?-ethenyl ligand by transfer of a bridging hydride from the diruthenium backbone onto the ?-C of the triple bond in ethynylferrocene. The ferrocenyl-contg. diruthenium compds. [BF4] and [BF4] as well as their parent compds. [BF4] and [BF4] were studied by voltammetric techniques: Whereas 1 shows only an irreversible Ru(II)/Ru(III) oxidn., the phosphido-bridged deriv. 2 displays two well-sepd. 1-electron redox processes. In the case of 3 and 4, the ferrocenyl substituents give rise to addnl. reversible ferrocene/ferrocenium waves. [on SciFinder(R)]
Type de publication
Resource Types::text::journal::journal article