Covalent conjugated porphyrin polymers

Fe(III)-protoporphyrin-IX-dimethylester (7d) (0.03 mol%) was copolymerized with 7-conjugated monomers like styrene or methyl methacrylate in bulk and acrylamide in methanol using radicalic initiators Increasing the ratio of [7d]/[styrene] the molecular weight decreased (Table 3) indicating a chain transfer efiect of the porphyrin (chain transfer coeffident C,= 2.3). On the other side the content of covalent bond is increasing (Table 3). Therefore it is supposed that the observed reduction of Fe(III) to Fe(II) led to an addition of one porphyrin only at the chain end to give the polymer (34) (Eq. 14). 

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