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A type of conjugated polymer ( P3 ) with the feature of aggregation-induced emission enhancement, and with diphenylphosphoryl-triazole (DPPT) attachment, was successfully synthesized by Cu + -catalyzed click postpolymerization. P3 displayed specifi c optical response toward Ag + in organic/aqueous mixtures with relatively high-water-fraction ratio ( V THF / V water = 2:3). With the addition of Ag + , absorption profi le of P3 exhibited obvious redshift (≈ 30 nm), accompanied by the decrease of absorbance and fl uorescence (at ≈ 500 nm). As evaluated from the detailed fl uorescence alteration of P3 against incremental Ag + , the detection limit of Ag + reached ≈ 11 × 10 −9 M (3 σ , S/N = 3). The presence of other common background metal ions brought insignifi cant interference for the Ag + probing by P3 . Further investigation revealed that the presence of DPPT segment played a key role for the detection of Ag + by P3 .

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.