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Multiple Logic Fluorescent Thermometer System Based on N-Isopropylmethacrylamide Copolymer Bearing Dicyanomethylene-4H-pyran Moiety

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journal contribution
posted on 10.03.2009, 00:00 by Zhiqian Guo, Weihong Zhu, Yuyan Xiong, He Tian
The development of polymeric systems that can integrate individual basic logic gates into combinational circuits has been extremely interesting as smart materials. A novel thermometer fluorescent sensor poly(NIPMAM-co-MDCPDP) consisting of N-isopropylmethacrylamide (NIPMAM) as a thermoresponsive unit and dicyanomethylene-4H-pyran derivative as a dipolar-sensitive fluorophore unit was designed. Poly(NIPMAM-co-MDCPDP) performs fluorescence quenching merely by coordination with Cu2+ ions or increasing temperature in neutral or acid aqueous solution. The ON−OFF fluorescence response of poly(NIPMAM-co-MDCPDP) is driven by a temperature-induced phase transition from coil to globule and the capture of Cu2+ ions, resulting in a decrease of the ICT efficiency in neutral solution. The combinational serial NOR logic operation as well as two INHIBIT logic gates was constructed with three inputs: various pH, temperature change, and Cu2+ ions. The proposed combinational logic circuits play a key role in mimicking comprehensive arithmetic operations at the nanoscale level.