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Polynorbornenes Containing Ferrocene Derivatives and Alkyne‐bis(tricarbonylcobalt)
Author(s) -
AbdElAziz Alaa S.,
Winram Diana J.,
Shipman Patrick O.,
Bichler Lukas
Publication year - 2010
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201000395
Subject(s) - moiety , ferrocene , polymer chemistry , norbornene , romp , cationic polymerization , chemistry , alkyne , polymerization , monomer , cobalt , polymer , chlorobenzene , hexafluorophosphate , metathesis , electrochemistry , organic chemistry , catalysis , ionic liquid , electrode
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.