Polyterthiophene appended by transition-metal cluster: electropolymerization of 3′-[CCo3(CO)9]-5,2′:5′,2″-terthiophene

Terthiophene, to which cobalt carbonyl cluster complex is π-conjugated, 3′-[CCo3(CO)9]-5,2′:5′,2″-terthiophene (3′-CoTTh), was prepared by reaction of 3′-chloromercuro-5,2′:5′,2″-terthiophene with HCCo3(CO)9. The molecular structure of 3′-CoTTh is identified by spectroscopic methods and elemental analysis. Cyclic voltammetry of 3′-CoTTh showed deposition of electroactive polymer films on the electrode surface. The absorption spectra of 3′-CoTTh and its polymer films are presented.