Diphenylphosphoryl‐Triazole‐Tethered, AIEE‐Type Conjugated Polymer as Optical Probe for Silver Ion in Relatively High‐Water‐Fraction Medium

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 specific 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 profile of P3 exhibited obvious redshift (≈ 30 nm), accompanied by the decrease of absorbance and fluorescence (at ≈ 500 nm). As evaluated from the detailed fluorescence 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 insignificant 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 .