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A new type of conjugated polybenzimidazole ( CPBI ) was synthesized through a simple polycondensation reaction without metal catalysis, and N -alkylation modification was carried out to solve the problems of solubility and fluorescence properties. A series of nano-microsphere polymers CPBI  n   with large conjugation, good solubility, and strong fluorescence has been successfully used as "turn-off" fluorescent probes for the first time. The results show that, under suitable N -alkylation conditions, the obtained CPBI  n   can be used as a highly sensitive and selective fluorescent probe for the detection of Cu 2+ and Zn 2+ at the same time, and their detection limits are both nM levels. In addition, CPBI 2  can be designed as an ultra-sensitive IMPLICATION logic gate at the molecular level, cyclically detecting Cu 2+ . With the test paper containing CPBI 2  , easy and quick on-site detection can be achieved. This research provides a new idea for the brief synthesis of multifunctional materials.

Preparation of Large Conjugated Polybenzimidazole Fluorescent Materials and Their Application in Metal Ion Detection