Regioselective synthesis and electrochemical properties of π-conjugated cobaltacyclopentadiene oligomer and polymer complexes

Abstract

Perfectly π-conjugated cobaltacyclopentadiene oligomer and polymer complexes were synthesized by polycondensation of a dihalogenated cobaltacyclopentadiene complex, [Co{C(C₆H₄I-4)CBuⁿCBuⁿC(C₆H₄I-4)}(cp)(PPh₃)] (cp = η⁵-C₅H₅), with [Ni(cod)₂] (cod = cycloocta-1,5-diene). Their internuclear electronic interaction energy in the mixed-valence state, u_OR, was estimated to be ca. –2 kJ mol^–1 by electrochemical analysis.