Electrochemical generation of stable bis(fulvalene)dimetal anions [(.eta.5:.eta.5'-C10H8)2MCo]- (M = Fe, Ru, Co)

Effect of ligand structure, solvent, and temperature on the electrochemical behavior of polyarene–iron complexes

“…The oxidationJreduction properties of oligomeric and polymeric materials have led to a thorough investigation of the electron transfer reactions in these complexes (15)(16)(17)(18)(19)(20)(21)(22)(23). This interest stems from the ability of these systems to exhibit mixed valency (3,4,(24)(25)(26)(27) and conductivity (28), as well as to sometimes act as electron reservoirs that initiate electron-transfer chain catalysis (1,(29)(30)(31)(32)(33)(34)(35)(36).…”

“…There has been a tremendous effort to study the electrochemistry of bi-and polymetallic complexes because of the possible communication of the metallic species via the backbone of the coordinating ligands (7,17,(20)(21)(22)(23)(24)(25). The type of metal present as well as the bridging ligands often dictates whether the metal centers are interacting with, or isolated from, one another.…”

Synthesis, structure and properties of new iron–molybdenum and –tungsten fulvalene-bridged heterobimetallic complexes

“…In contrast, however, the significant majority of ferrocene-containing heterobimetallic complexes feature nonfulvalenyl bridges.,' -' Furthermore, the few examples of fulvalene-bridged, ferrocene-containing heterobimetallics are mostly of the bis(metal1ocene) type, namely [(C,H,)FeC,H,-C,R,M(C,R',)L,]. [26][27][28][29][30][31][32][33] This historically reflects a paucity of useful synthetic routes to such c ~m p l e x e s . ~~, ~~-~~ The preparation of fulvalene (and related)-bridged heterobimetallics of the type [(C,H,)FeC,H,C,R,ML,] where ML, is not metallocene-like in nature is therefore an attractive goal because of the huge variety of possible metal-ligand combinations ML, and the proven ability of the fulvalene linkage to enable communication between metal centres.…”

Synthesis and electrochemistry of novel heteronuclear Fe–Ru bi- and quatermetallocenes, conjugatively connected by ethene and thiophene bridges

“…Non-conjugatively bridged ruthenocenylmetallocene systems have been previously shown [17,18] to exhibit the typical electrochemical behavior of separate metallocene fragments (apart from shifts to more positive potential due to coulombic interaction between the two linked metallocene centers): a reversible one-electron transfer for ferrocene (and cobaltocene), and an irreversible one-or two-electron transfer for ruthenocene. However, the same behavior has been observed also in cases of conjugatively bridged oligometallocenes with varying conjugation lengths [19].…”