Quinolinyl‐moiety‐containing 3‐ester‐substituted polythiophenes showing fluorescence efficiency

Abstract

Polythiophenes with ester substituents at the 3-position of the thiophene ring were synthesized by ferric chloride oxidative polymerization. The polythiophenes are partially soluble in tetrahydrofuran, and these solutions were used to characterize the polythiophenes using Fourier transform infrared, 1 H NMR, UV-visible and fluorescence spectroscopy, gel permeation chromatography, thermogravimetric analysis, differential scanning calorimetry and cyclic voltammetry. The electrochemical band gap of the polymers is in the range 1.6-2.3 eV. The effect of the various substituents on the fluorescence behaviour was studied in detail. The quinolinyl-moiety-containing polythiophene ester has the highest fluorescence quantum yield. The incorporation of Al 3+ and Zn 2+ ions increases greatly the fluorescence intensity. The electroluminescence properties of the polymers were evaluated with a device configuration of ITO/PEDOT : PSS/polymer/LiF/Al. The polymers show a yellow emission in electroluminescence spectra. The results suggest that the quinoline-containing ester-substituted polythiophene is a promising electronic and optoelectronic material.

Platinum-Catalyzed Assembly of Quinaldine from Aniline and Ethylene

“…The synthesis of quinoline derivatives is the subject of intense research because of the presence of the quinoline scaffold in a number of biologically active compounds such as antimalaria, anti-inflammatory, antiasthmatic, antibacterial, antihypertensive and tyrosine kinase inhibiting agents . In addition, quinoline molecules, metal complexes and polymers are being investigated as materials for electronic and optoelectronic applications. − The simplest quinoline derivative is 2-methylquinoline, or quinaldine. It finds applications as anesthetic, in bioimaging, as sensitizers for photodynamic therapy, − and in the preparation of a number of other heterocyclic compounds.…”