Cobaltocenium-containing methacrylate homopolymer, poly(2-(methacrylolyoxy)ethyl cobaltoceniumcarboxylate hexafluorophosphate) (PMAECoPF 6 ), was prepared by reversible addition−fragmentation chain transfer polymerization (RAFT). Using the homopolymer as a macroinitiator, three different diblock copolymers, including a novel heterobimetallic diblock copolymer with ferrocene units as the second block, were synthesized via chain extension. Kinetic studies showed that all chain extension followed a controlled/ living process under relatively lower conversion. The heterobimetallic diblock copolymer self-assembled into spherical micelles in selective solvents. The formation of aggregates depended on the location of the ferrocene block in the micelles. While the ferrocene units were susceptible to oxidation toward decomposition, the cobaltocenium moiety exhibited extraordinary stability to maintain its structure integrity.
The synthesis and radical polymerization of an 18-e cobaltocenium vinyl monomer, 2-acryloyloxyethyl cobaltoceniumcarboxylate hexafluorophosphate (AECoPF 6 ), are reported. The side-chain cobaltocenium-containing polymer, poly(acryloyloxyethyl cobaltoceniumcarboxylate hexafluorophosphate) (PAECoPF 6 ), is a water-soluble hydrophilic polyelectrolyte. Through an effective ion-exchange process, this polymer was transformed into a hydrophobic poly(acryloyloxyethyl cobaltoceniumcarboxylate tetraphenylborate) (PAECoBPh 4 ) polymer, soluble in strong polar solvents such as dimethylformamide and dimethyl sulfoxide. Electrochemical studies showed that both polymers have reversible redox processes in dimethylformamide. These polymers exhibited high thermal stability.
The synthesis of side-chain cobaltocenium-containing block copolymers and their self-assembly in solution was studied. Highly pure monocarboxycobaltocenium was prepared and subsequently attached to side chains of poly(tert-butyl acrylate)-block-poly(2-hydroxyethyl acrylate), yielding poly(tert-butyl acrylate)-block-poly(2-acryloyloxyethyl cobaltoceniumcarboxylate). The cobaltocenium block copolymers exhibited vesicle morphology in the mixture of acetone and water, while micelles of nanotubes were formed in the mixture of acetone and chloroform.
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