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Thermo-responsive hyperbranched copoly(bis( N , N -ethyl acrylamide)/( N , N -methylene bisacrylamide)) (HPEAM-MBA) was synthesized by using reversible addition-fragmentation chain-transfer polymerization (RAFT). Interestingly, the zinc ion (Zn 2+ ) was found to have a crucial influence on the lowest critical solution temperature (LCST) of the thermo-responsive polymer. The tetraphenylethylene (TPE) unit was then introduced onto the backbone of the as-prepared thermo-responsive polymer, which endows a Zn 2+ -responsive "turn-off" effect on the fluorescence properties. The TPE-bearing polymer shows a highly specific response over other metal ions and the "turn-off" response can even be tracked as the concentration of Zn 2+ reduces to 2 × 10 -5 M. The decrement of fluorescence intensity was linearly dependent on the concentration of Zn 2+ in the range of 4-18 μmol L -1 . The flexible, versatile and feasible approach, as well as the excellent detection performance, may generate a new type of Zn 2+ probe without the tedious synthesis of the moiety bearing Zn 2+ recognition units.

rsc advances

Facile construction of a hyperbranched poly(acrylamide) bearing tetraphenylethene units: a novel fluorescence probe with a highly selective and sensitive response to Zn<sup>2+</sup>

Facile construction of a hyperbranched poly(acrylamide) bearing tetraphenylethene units: a novel fluorescence probe with a highly selective and sensitive response to Zn2+

Facile construction of a hyperbranched poly(acrylamide) bearing tetraphenylethene units: a novel fluorescence probe with a highly selective and sensitive response to Zn²⁺