Polyethers and thioethers incorporating neutral and ...
|Title||Polyethers and thioethers incorporating neutral and cationic organoiron complexes.|
|Author(s)||A. Abd-El-Aziz, E. Todd, R. Okasha|
|Journal||Section Title: Chemistry of Synthetic High Polymers, Macromolecular Symposia|
|Issue||Metal- and Metalloid-Containing Macromolecules|
|Abstract||A review summerizes the synthesis and property of linear and star-shaped oligomers contg. cationic and neutral organoiron groups in their structures achieved by reaction of cationic arene complexes of cyclopentadienyliron contg. terminal hydroxyl groups with 1,1'-ferrocenedicarbonyl chloride or ferrocene carboxylic acid. The use of chloroarene complexes allowed for the formation of triiron complexes that were subsequently polymd. via nucleophilic arom. substitution with various oxygen- and sulfur-based dinucleophiles. In ref. to cited articles, the corresponding polyethers and thioethers were isolated in good yields and these materials exhibited excellent solubilities in polar org. solvents. Cyclic voltammetric investigations revealed that the cationic iron centers pendent to the polymer backbones underwent reversible redn. steps, while the neutral iron centers within the polymer backbones underwent reversible oxidn. steps. Photolysis of these polymers resulted in the removal of the cationic cyclopentadienyliron moieties pendent to the polymer backbones. Thermogravimetric anal. (TGA) revealed that the cationic iron complexes were cleaved from the polymers at approx. 210 Â°C. Differentials scanning calorimetry (DSC) revealed that the glass transition temps. of the cationic polymers occurred at higher temps. than their neutral analogs. [on SciFinder(R)]|
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