Add time:08/01/2019         Source:sciencedirect.com

[(C5Me5)Fe(CO)2]2 (A) reacts with one equivalent of tetracyanoethylene (TCNE) and tetracyanoquinodimethane (TCNQ) to give the compounds {2[(C5Me5)Fe+(CO)2]·TCNE2−} (B) and {2[(C5Me5)Fe+(CO)2]·TCNQ2−} (D) respectively. The reaction of A with two equivalents of TCNE gives the polymeric compound [(C5Me5)Fe(CO)2TCNE]n (C) in which the TCNE2− anion is coordinated to the metal through nitrogen of the CN group. Electronic, IR and ESR spectra indicate that compounds B and D are formed by two one-electron steps involving the rather elusive [(C5Me5)Fe(CO)2] radicals. The electron transfer processes are discussed on the basis of the thermodynamic redox potentials of donor A and of two acceptors TCNE and TCNQ.

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