Polynorbornenes Containing Ferrocene Derivatives and Alkyne-bis(tricarbonylcobalt)

✍ Scribed by Alaa S. Abd-El-Aziz; Diana J. Winram; Patrick O. Shipman; Lukas Bichler

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 602 KB
• Volume: 31
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.201000395

✦ Synopsis

Abstract

Coordination of dicobalt hexacarbonyl to the alkyne moiety of norbornene complexes containing either ferrocene or η^6^‐chlorobenzene‐η^5^‐cyclopentadienyliron hexafluorophosphate, gave two unique trimetallic complexes available for ROMP. Polymerization of each monomer using Grubbs second generation catalyst gave organoiron/organocobalt polynorbornenes with weight average molecular weights between 55 300 and 69 000 with PDIs between 1.2 and 1.9. Cyclic voltammetric studies of the monomers and polymers at −40 °C showed a reversible reduction for cationic complexes containing η^6^‐benzene‐η^5^‐cyclopentadienyliron and for the dicobalt hexacarbonyl moieties while, a reversible oxidation for the ferrocene containing complex was observed. Thermal analysis showed that the cobalt carbonyl moiety of the polymers degraded near 130 °C; however, the polymeric backbone was stable up to 350 °C. Scanning electron microscopy (SEM) and SEM‐EDS indicated that the polymers possessed a fine globular morphology and that the distribution of iron and cobalt atoms was homogenous on the macro‐scale.
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