Voltammetric study of some metallocene-substituted (η4-1,3-cyclopentadiene-5-exo-yl) cobalt complexes; ([CpCo(η4-C5H5R)], R = −C C-(η5−C5H4)FeCp; -(η5−C5H4)FeCp; -(η5C5H4)NiCp)

✍ Scribed by Dagmar Obendorf; Edgar Reichart; Christopher Rieker; Herwig Schottenberger

• Book ID: 103065342
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 870 KB
• Volume: 39
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(94)00205-3

✦ Synopsis

The redox behaviour of three metallocene substituted (t$-cyclopentadienyl) (q4-1,3-cyclopentadien&exo-yl) cobalt complexes have the general formular [CpCo(@-C,H5R)], where R = -C=C-($-C,H&FeCp (3), -(q"-C,HJFeCp (4) or -(n5-CsHJNiCp) Q, was studied by cyclic voltammetry and related techniques. Oxidation occurs by an ECE (E = electrochemical step, C = chemical step) process. The character of the chemical step has heen probed by cyclic voltammetry in solvents of varying donor ability. In the case of (4) and (5). voltammetric data obtained in solvents of low donor ability, like dichloromethane or nitromethane, indicate formation of bimetallocenes by oxidative deprotonation, whereas the chemical step after oxidation of (3), (4) or (5) in acetonitrile is addition of solvent molecules to the cation, leading to decomposition of the complexes and formation of an electroactive solvent adduct of a cyclopentadienyl cobalt complex [lf5-CpCo(L)s]+. Kev words: metallocene substituted (#-cyclopentadiene)(q5-