Building N-Heterocyclic Carbene into Triazine-Linked Polymer for Multiple CO2Utilization

The development of new CO(2)detection technologies and CO2capture-conversion materials is of great significance due to the growing environmental crisis. Here, multifunctional triazine-linked polymers with built-in N-heterocyclic carbene (NHC) sites (designated as NHC-triazine@polymer) are presented for simultaneous CO(2)detection, capture, activation, and catalytic conversion. NHC-triazine@polymer were readily obtained through polymerization of cyanophenyl-substituted NHC. The obtained film-like polymers exhibited interesting CO2-triggered fluorescence turn-on response and CO2-sensitive reversible color change. Both NHC and triazine sites could act as efficient binding sites for CO2, and the CO(2)uptake of NHC and triazine reached 1.52 and 1.36 mmol g(-1), respectively. Notably, after being captured by NHC, CO(2)was activated into a zwitterionic adduct NHC-CO(2)that could be easily transformed into cyclic carbonate in the presence of epoxides. Moreover, NHC-triazine@polymer were stable and active catalysts for the conversion of low-concentration CO(2)in a gas mixture (7 vol %) into cyclic carbonates as well as for hydrosilylation of CO(2)to formamides.