Multicomponent Synthesis of Imidazole-Based Cross-Conjugated Polymers via Bimetallic Cu(I)/Rh(II) Relay Catalysis

摘要

An efficient synthetic methodology for imidazole-based cross-conjugated polymers through bimetallic Cu(I)/Rh(II) relay-catalyzed multicomponent polymerization has been established. This polymerization employs readily available monomers, including aryl alkynes, azides, and aryl nitriles. Cu-catalyzed azide-alkyne cycloaddition (CuAAC) occurs first in this polymerization followed by the Rh-catalyzed ring-opening/transannulation of triazole intermediates. Various new imidazole-based cross-conjugated polymers with high molar mass (up to 375.8 kDa) have been prepared smoothly in high yields (83-98%). These polymers exhibit tunable optical properties and broad band gaps (E-g > 2.0 eV), featuring great application potential in organic electronic materials. This bimetallic relay-catalyzed multicomponent polymerization provides an alternative and highly efficient approach toward novel structural conjugated materials from simple building blocks via one-pot reactions.

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