Optical, electrochemical, and sensing properties of polyfluorenes bearing thiazole or oxazole and triphenylamine in the main chain

Abstract

Polyfluorenes bearing thiazole (PFTH) or oxazole (PFOX) heterocyclic units as well as triphenylamine (TPA) in the main chain were synthesized. The ratio of thiazole or oxazole/TPA in the polymer chain varies from 100/0 to 25/75. The optical properties of polymers depend on thiazole or oxazole contents. Cyclic voltammetry reveals that thiazole or oxazole hinder the oxidation of polymers and only polymers with TPA show reversible oxidation. The Electron Affinities do not practically depend on composition of the polymer chain. The sensing properties of polymers PFTH100 and PFOX100 are investigated toward several cations and anions. Polymers detect two analytes, Fe2+ and Hg2+. PL quenching shows linear response to Fe2+ in wide concentration region 1–800 μΜ. I− anions quench the emission of polymers. Hg2+ turns on the emission of the polymer/I− complex at concentrations as low as 1 μM. Enhancement of polymer/I− emission exhibits linear response to Hg2+ concentration. PFTH100 is able to detect Fe2+ and Hg2+ that coexist in a solution. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 243–254

Optical and electrochemical properties and sensing application for iron(II) and mercury(II) ions of polyfluorenes with imidazole in the main chain

“…Therefore the PFIM100/iodide system could be used as a chemosensor for Hg 2+ detection and quantification. The quantification range was comparable to that of polyfluorenes with thiazole or oxazole in the main chain . PFIM100/iodide can also serve as a ‘naked‐eye’ probe for Hg 2+ since the yellow colour of PFIM100/iodide faded upon addition of Hg 2+ (Fig.…”

“…Therefore polymer PFIM100 could detect and quantify Fe 2+ ions via an emission ‘turn‐off’ mechanism. Polyfluorene bearing thiazole units in the main chain detected and quantified Fe 2+ in a much greater range of concentrations . In contrast, PFIM100 showed a quantification range comparable to that of oxazole‐containing polyfluorene .…”

“…Polyfluorene bearing thiazole units in the main chain detected and quantified Fe 2+ in a much greater range of concentrations . In contrast, PFIM100 showed a quantification range comparable to that of oxazole‐containing polyfluorene . Interferences by other metal ions were assessed by competitive experiments.…”

Dimedone‐decorated conjugated polymer: Tandem knoevenagel‐michael post‐modification synthesis and its application as optical probe for Hg2+ and ClO− in high‐water‐fraction mediums

“…Inspired by this, this reaction can be utilized to construct optical probes for the detection of cations or reactive oxygen species (ROS) when selecting some chromophore‐functionlized arylaldehydes as starting materials. The detection of metal ions, especially heavy metal ions, which are harmful to humans healthy, has attracted tremendous attention in nowadays. On the other hand, ROSs like superoxide anion radical (O 2 • − ), hydrogen peroxide (H 2 O 2 ), peroxynitrite (ONOO − ), nitric oxide (NO) and hypochlorous acid (HClO) are involved in signal transduction and diverse pathological conditions, and it is vital to design and synthesize the probe which can response to these ROSs.…”