Optoelectronic Properties and Electrochromic Device Application of Novel Pyrazole Based Conducting Polymers


ÇAMURLU P., Gultekin C., Guerbulak V.

JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY, vol.50, no.6, pp.588-595, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 50 Issue: 6
  • Publication Date: 2013
  • Doi Number: 10.1080/10601325.2013.784546
  • Journal Name: JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.588-595
  • Keywords: 3, 5-di-thiophen-2-yl-1H-pyrazole, 3-hexylthiophene, n-methyl pyrrole, conducting polymers, electrochemical copolymerization, electrochromic device, BAND-GAP, DONOR, COPOLYMERS, THIOPHENE, PYRIDINE, DERIVATIVES, REDUCTION, DESIGN, UNITS
  • Akdeniz University Affiliated: Yes

Abstract

Here we report on the synthesis and characterization of pyrazole based conducting polymers and utilization of these polymers in electrochromic devices. For this purpose, 3,5-di-thiophen-2-yl-1H-pyrazole (DThPz) was synthesized via a Knorr type reaction and it was electrochemically polymerized. The resultant homopolymer had a band gap of 2.6eV and displayed yellow to mode beige coloration upon doping. In order to enhance the switching characteristic; electrochemical copolymerization of DThPz in the presence of 3-hexylthiophene (HTh) and N-methyl pyrrole (NMP) was performed. Spectroelectrochemistry analysis of poly(DThPz-HTh) reflected electronic transitions at 405 and 740nm due to * transition and charge carrier band formation, respectively. The polymer displayed color change from chrome yellow to blue upon doping. Poly(DThPz-NMP), on the other hand had a * transition at 355nm and formation of new transitions at around 750nm was observed. Additionally, as an application, dual-type electrochromic devices based on both poly(DThPz-HTh) and poly(DThPz -NMP) were assembled and characterized via spectroelectrochemistry, kinetic and colorimetry studies.