Polymeric pseudocrown ether networks were formed in situ by the photopolymerization of poly(ethylene glycol) diacrylate (PEGDA)/transition metal complexes. The metal - monomer complex led to a near circular conformation of the monomer in which the two reactive end groups are brought into close proximity; thus, the probability of intramolecular cyclization (i.e., pseudocrown ether formation) is increased. Complexes of cobalt(II), nickel(II), zinc(II), cadmium(II), chromium(III), copper(II), neodymium(III), and lithium were characterized using FTIR and UV - vis spectroscopy. Metal-monomer interactions were characterized and the importance of coordinated water and anions was elucidated. A novel technique of replacing coordinated waters by monomeric ether oxygens was discovered. Pseudocrown ether network formation was confirmed via a study of the polymerization kinetics of cobalt(II): PEGDA systems in which a decrease in autoacceleration was observed with increasing pseudocrown ether formation.
|Number of pages||10|
|Journal||Chemistry of Materials|
|Publication status||Published - 2000|