N-Unsubstituted-1,2,3-triazole-tethered, AIEE type conjugated polymer as a ratiometric fluorescence probe for silver ions

Abstract

A type of N-unsbustituted-1,2,3-triazole-decorated conjugated polymer (P3), which with the feature of aggregation-induced emission enhancement (AIEE), was successfully synthesized via Cu + -catalyzed Click reaction between the acetylenesubstituted precursor polymer (P2) and azidotrimethylsilane. Except for Ag + , the introduction of other metal ions brought slight influence to the optical properties of P3. With the introduction of aqueous Ag + , fluorescence of P3 in THF-water mixture (V THF /V Water =4/1) (buffered with Tris-CA, 1 mM, pH=7.4) displayed ratiometric alteration at blue (~ 420 nm) and green (~ 495 nm) bands. Corresponding I 495 /I 420 ratio values remained upward trend throughout the titration process of Ag + .The detection limit of Ag + reaches ~ 1.4 µM (3σ/k), as evaluated form the corresponding relationship between I 495 /I 420 and [Ag + ]. The aggregation between polymer chains induced by Ag + -triazole interrelation is the plausible reason for the alteration of P3's optical properties.CP. This CP, referred as P3, displayed distinctive ratiometric fluorescence alteration toward Ag + . The relating probing properties were systematically investigated here.Selective fluorescence ratiometric detection of Ag + was achieved by N-unsubstituted-1,2,3-triazole decorated, aggregation-induced emission enhancement (AIEE) type conjugated polymer.

Zn2+‐induced AIEE‐Active Conjugated Oligomers for Highly Selective Recognition of Zn2+ with an Impressive Blue Shift

“…The introduction of ionophore (cation receptor) into the polymer backbone is an effective strategy to design metal ion fluorescence probes. Shi and co‐workers [4c,5] reported the conjugated polymer containing diphenylphosphoryl‐triazole unit and N ‐unsbustituted‐1,2,3‐triazole unit as fluorescent probes for the detection of Ag + , based on the sensing mechanism of aggregation‐induced fluorescence quenching. Wei et al [6] have presented that an AIEE‐active conjugated polymer incorporating thiazole moiety or 1,2,3‐triazole moiety as the recognition unit exhibited “turn‐off” fluorescence quenching responses towards Hg 2+ , Ag + and Cu 2+ , respectively.…”