Single electron reduction of tetracyanoquinodimethane, TCNQ, and phenazine and two electron reduction of TCNQ by organo-iron electron reservoir complexes

cp(C6Me6)FeI, (1), (cp = C5H5) reacts with one equivalent of phenazine and tetracyanoquinodimethane, TCNQ, to give the single electron transfer salts cp(C6Me6)Fe+, phenazine–, (2), and cp(C6Me6)Fe+, TCNQ–, (3), whereas addition of TCNQ to 2 equivalents of (1) or cp(PriPh)FeI gives the crystalline salts {cp(arene)Fe+}2 TCNQ2–, (4) and (5); (C6Me6)2Fe0, (7), also reacts with one equivalent of these acceptors to give (C6Me6)2Fe+, phenazine–, (8) and (C6Me6)2Fe+ TCNQ–, (9).