Optimization of triphenylamine-based polyimide structure towards molecular sensors for selective detection of heavy/transition metal ions

被引:5
作者
Butnaru, Irina [1 ]
Constantin, Catalin-Paul [1 ]
Damaceanu, Mariana-Dana [1 ]
机构
[1] Petru Poni Inst Macromol Chem, Electroact Polymers & Plasmochem Lab, Aleea Gr Ghica Voda 41A, Iasi 700487, Romania
关键词
Polyimides; Bipyridylamine; Photo-optical behavior; Electroactivity; Metal-ion sensing; Turn-on fluorescence; FLUORESCENT SENSOR; UNITS; POLYMER; COPOLYMERS; PYRIDINE; BIPYRIDINE; INSIGHTS; FE3+;
D O I
10.1016/j.jphotochem.2022.114271
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A series of well-defined triphenylamine (TPA)-based polyimides having a stiff core or different flexible/kinking linkages in the main chains and pendant bipyridylamine (biPyA) ligands were developed with the aim to test them as chemosensors for selective detection of heavy/transition metal ions. Besides a detailed structural characterization by NMR/ FTIR spectroscopies, gel permeation chromatography and solubility tests, the che-mosensors were investigated with regard to their thermal, photo-optical and electrochemical properties to anticipate their behavior in the ion sensing studies. The synergism between the main structural elements in these polymers proved to be beneficial towards developing materials that may withstand elevated temperatures and with optical behaviour depending on the chemical structure and macromolecular surrounding environment. With the support of DFT simulation, both localized and intramolecular charge transfer states were identified, which were responsible for the variable fluorescence signature of the polymers in solvents of different polarities. The TPA and imide units endowed these polymers with significant electroactivity, which was further exploited to evidence the metal ion detection capability of the chemosensors. For the first time, these unknown polyimides functionalized with biPyA receptor were explored in the detection of metal ions by three complementary methods, namely UV-vis absorption, fluorescence and electrochemistry. The polyimide with flexible ether bridges experienced selective turn-on fluorescence response to Zn2+ ion over a variety of other competing cations that had no or little influence on its fluorescence change. Whereas, complete fluorescence quenching was trig-gered by Fe3+ ions when progressively loaded to the solution of the analogous more rigid polyimide containing carbonyl bridged group. This demonstrates that the modulation of chelating ability of biPyA receptor through the macromolecular design is an appropriate tool to achieve high sensitivity towards a specific metal ion.
引用
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页数:17
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