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À propos de : Characterization and Polymerization of MetalComplexes of Poly(ethylene glycol) Diacrylates and theSynthesis of Polymeric Pseudocrown Ethers        

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  • Characterization and Polymerization of MetalComplexes of Poly(ethylene glycol) Diacrylates and theSynthesis of Polymeric Pseudocrown Ethers
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  • Polymeric pseudocrown ether networks were formed in situ by the photopolymerizationof poly(ethylene glycol) diacrylate (PEGDA)/transition metal complexes. The metal−monomercomplex led to a near circular conformation of the monomer in which the two reactive endgroups 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 characterizedusing FTIR and UV−vis spectroscopy. Metal−monomer interactions were characterized andthe importance of coordinated water and anions was elucidated. A novel technique ofreplacing coordinated waters by monomeric ether oxygens was discovered. Pseudocrown ethernetwork formation was confirmed via a study of the polymerization kinetics of cobalt(II):PEGDA systems in which a decrease in autoacceleration was observed with increasingpseudocrown ether formation.
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