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A Ligand-Bridged Heterotetranuclear (Fe2Cu2) Redox System with Fc/Fc( ) and Radical Ion Intermediates
Jana Rajkumar
Lissner Falk
Schwederski Brigitte
Fiedler Jan
Kaim Wolfgang
Organometallics, 2013, 32(20): 5879-5886.
The redox pair [(mu-abcp){Cu(dppf)}(2)](2 / ) (abcp = 2,2'-azobis(5-chloropyrimidine) and dppf = 1,1'-bis(diphenylphosphino)ferrocene) has been structurally characterized to reveal the lengthening of the NN and shortening of the CNazo bonds on reduction, each by about 0.04 angstrom. These and other charge forms, [(mu-abcp){Cu(dppf)}(2)](n ) (n = 0, 3 , 4 ), have been investigated spectroelectrochemically (UV-vis-near-IR, EPR) to reveal an abcp-based second reduction and a stepwise ferrocene-centered oxidation of the 2 precursor. In contrast to the small but detectable comproportionation constant of K-c = 17 for the Fc/Fc( ) mixed-valence (3 ) charge state, the monocationic radical complex exhibits a very large K-c value of 10(16).
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