Polymers, vii, viii

Solubility - The oxidized polymer (VIII) has a greater solubility than the original polymer (VII). It was found to be soluble in acetone, chloroform, benzene, DMF and DMSO. Unlike the polymer (VII), (VIII) was not soluble in formic acid or trifluoroacetic acid that was expected since the pyrrole moiety is less basic than pyrrolidine. In the oxidized polymer, the pair of unshared electrons on the nitrogen atom are contributing to the pyrrole ring aromaticity, therefore, unavailable for protonation as in the case of polymer (VII). A comparison of the solubilities is given in Table I. [Pg.134]

No detailed experiments have been carried out yet to determine the usefulness of these polymers as chelating agents or drug carriers. However, preliminary tests with ethanolic solutions of metal acetates show that polymers VII, VIII, and XIV give colored complexes with some of the common transition elements. In the case of VIII, a green complex is formed with cupric acetate and a yellow complex with oobaltic acetate. More complete experiments will be reported in a latter communication. [Pg.223]

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