A novel oligo-pyrazole-based thin film: synthesis, characterization, optical and morphological properties

Cetin A., Korkmaz A., Bildirici İ.

COLLOID AND POLYMER SCIENCE, vol.296, no.7, pp.1249-1257, 2018 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 296 Issue: 7
  • Publication Date: 2018
  • Doi Number: 10.1007/s00396-018-4342-7
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1249-1257
  • Keywords: Absorbance, Conjugated polymer, Organic semiconductor, Pyrazole, Thin film, BAND-GAP POLYMERS, SOLAR-CELLS, TANDEM POLYMER, COMPOSITE, FABRICATION, MEMBRANES
  • Van Yüzüncü Yıl University Affiliated: Yes


Pyrazole-3,4-dicarboxylic acid 2 was synthesized via the hydrolysis of pyrazole-3-carboxylic acid 1 and subsequently heated with thionyl chloride to give the novel pyrazole-3,4-dicarbonyl dichloride 3, which was easily converted into oligo-pyrazole 4 upon its reaction with p-phenylene-diamine. These newly synthesized compounds were characterized by H-1-NMR, C-13-NMR, and FT-IR spectroscopy, and gel permission chromatography (GPC). Three novel oligo-pyrazole thin films were prepared using oligo-pyrazole 4 with these respective values of thickness: 20, 21, and 24 mu m. The optical properties of the films, including the absorbance, transmittance, and optical band gap, were determined using UV-vis spectroscopy. The E (g) values of the films were found to be 1.426, 1.537, and 1.648 eV for the 20, 21, and 24 mu m thick organic films, respectively. Atomic force microscopy (AFM) was used to examine the surface morphology and properties of the organic films. In the AFM images, a few black regions were observed and several yellow regions appeared over a large area, and the surface of the oligo-pyrazole films had an extremely low roughness value. The as-synthesized oligo-pyrazole has great potential in optoelectronic applications according to the optical properties of the as-prepared films.