Electronic modification of redox active ferrocenyl termini and their influence on the electrontransfer properties of 2,5-diferrocenyl-N-phenyl-1H-pyrroles

A series of 2,5-Fc2-cC4H2NPh (Fc = Fe(η5-C5H4)(η5-C5H4R), R = cC4H7O2; H; 3,5-(CF3)2-cC6H3; CHO; CN) has been prepared to study the intermetallic interactions in the mixed-valent species. A more electron-withdrawing group R results in a higher electron separation ΔE°′.397