Polynorbornenes containing ferrocene derivatives and ...



Title Polynorbornenes containing ferrocene derivatives and alkyne-bis(Tricarbonylcobalt).
Author(s) Alaa S. Abd-El-Aziz, Diana J. Winram, Patrick O. Shipman, Lukas Bichler
Journal Macromolecular rapid communications,
Date 2010
Volume 31
Issue 22
Start page 1992
End page 1997
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.
DOI 10.1002/marc.201000395

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