Ethynylene-Bridged Ferrocene-Anthraquinone FcAq Complexes

ETHYNYLENE-BRIDGED FERROCENE-ANTHRAQUINONE (FcAq) COMPLEXES [Pg.139]

IVansition Metal Complexes Containing Allenylidene and Cumnlenylidene [Pg.139]

Current interest in the chemistry of Ji-conjugated diyne and polyyne metal complexes linked with ferrocenyl groups have resulted in further discoveries of novel unsaturated carbene (M=CR R R = ferrocene, R = ferrocene, Ph, H, etc.) complexes derived from the resonance effects of the electron fluctuated spacers. This term of the metal complexes containing allenyhdene and cumnlenylidene derivatives has been considered and systematically investigated by Bruce in 1998. [Pg.139]

Vinylidenes (M=C=CR R ) are tautomers of 1-alkynes and reformed by a formal 1,2-shift of the alkyne hydrogen from Cl to C2 (H-C=C-H C=CH2). The lifetime of the vinylidene in the free state, H2C=C=CH2 is extremely short ( 10 s) therefore, unsaturated cumulenylidenes are extremely reactive and are considered to be important intermediates. The presence of a lone-pair (or two unpaired electrons) on the terminal carbon atom enables vinylidenes to be stabilized by coordination to a transition metal center. This is because some degree of backbonding from the metal to the carbon ligand may further strengthen the [Pg.139]

Several studies of electronic interactions between metal centers in ferrocenyl-alkynyl and -diynyl derivatives, metal- )w-acetylide complex-bridged ferrocenyl-aUcynyl monomer (MC1( C=C-Fc)(dppm)2 M = Ru, Os Fc = ferrocenyl, dppm = diphenylphosphinomethane) and dimer (M(-C=C Fc)2(dppm)2), have been reported. [Pg.140]

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