In the last decade, we have reported a series of conjugated metal-bridged bicyclic compounds, in which a metal atom is shared by two fused five-membered rings. These novel metalla-aromatic complexes have been named carbolong complexes. They show unique properties such as large Stokes shifts and long lived fluorescence, good photoacoustic and photothermal properties and good single-molecule conductivity characteristics and have been used as electron transport layers to boost the performance of organic solar cells. These results led to exploration of the construction of a π-conjugated polymer containing carbolong repeat units in its main chain. Herein, we report the synthesis by a polymerization reaction of equivalent carbynes and alkynes of metallaaromatic-containing conjugated polymers, or polycarbolongs. Notablely, the M≡C bond and C≡C bond contained in each monomer was connected with functional aromatic spacer. The insertion of metalla-aromatics containing dπ-pπ conjugated units into conjugated polymers could open up significant opportunities for preparation of functional materials.

Main-chain metallaaromatics-containing conjugated polymers

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ACS Fall 2022

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