Facile Construction of a Hyperbranched Poly(acrylamide) Bearing Tetraphenylethene Units: A Novel Fluorescence Probe with a Highly Selective and Sensitive Response to Zn2+
writer：Xuejing Liu, Y. Zhang, H. Hao, W. Zhang, Libin Bai,* Y. Wu, Hongchi Zhao, Hailei Zhang,* X. Ba
keywords：無
source：期刊
specific source：RSC Advances
Issue time：2018年
Thermo-responsive
hyperbranched copoly(bis(N, N-ethyl
acryl amide)/(N, N-methylene bisacrylamide)) (HPEAM-MBA) was synthesized by using reversible addition-fragmentation chain-transfer polymerization (RAFT). Interestingly, the zinc ion (Zn2+)
was found to exhibit 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 Zn2+-responsive “turn-off”
effect on the fluorescence property. 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 Zn2+ reducing to 2 ×10-5M. The decrement of fluorescence intensity was
linearly dependent with the concentration of Zn2+ in the range of
4-18 μmol/L. The flexible, versatile and feasible approach, as well as the
excellent detection performance, may generate a new type of Zn2+
probes without the tedious synthesis of the moiety
bearing Zn2+ recognition units.