• Bharat K Sharma

      Articles written in Journal of Chemical Sciences

    • Synthesis, Photophysical, Electrochemical and Thermal Studies of Triarylamines based on benzo[𝑔]quinoxalines

      Azam M Shaikh Bharat K Sharma Rajesh M Kamble

      More Details Abstract Fulltext PDF

      A series of novel dipolar and nonplanar compounds featuring electron acceptor benzo[𝑔]quinoxaline and various electron donor triarylamine units have been synthesized in good yields and fully characterized. The photophysical, electrochemical and thermal properties of the synthesized compounds are described. The photoluminescence properties of the synthesized molecules are influenced by peripheral amines. The derivatives have high Stokes shifts, low band gap and the Commission Internationale de l’Eclairage (CIE) coordinates are positioned in the green–yellow region of the chromaticity diagram. The ionization potentials and electron affinity were found to be in the range of 5.11–5.60 eV and 2.77–2.93 eV and are comparable to the commonly used hole transporters. Thermal studies also reveal that these synthesized molecules have good thermal stability with 5% and 10% weight loss temperature ranging from 200 to 355°C and 268 to 442°C, respectively.

    • Synthesis, photophysical, electrochemical and thermal investigation of Triarylamines based on 9𝐻-Xanthen-9-one: Yellow–green fluorescent materials

      Bharat K Sharma Azam M Shaikh Rajesh M Kamble

      More Details Abstract Fulltext PDF

      Triarylamines containing 9𝐻−Xanthen−9−one core and aromatic units such as phenyl, naphthyl and p−methoxyphenyl were synthesized by employing palladium catalyzed C−N bond forming amination reaction in good yields. The photophysical studies revealed that the absorption and emission spectra are influenced by the nature of the peripheral amines. The photoemission spectra can be readily tuned in the range 483–532 nm (solution) and 525–576 nm (film) displaying green or yellow emission (film) depending on the nature of the amine segment with optical band gaps in the range 2.52–2.75 eV (film). The ionization potential and electron affinity were found to be in the range 5.332–5.686 eV and 2.705–2.776 eV, respectively. Thermal studies revealed that the synthesized compounds have good thermal stability with 5% and 10% weight loss at temperature ranging from 260–330° C and 340–370° C, respectively.

  • Journal of Chemical Sciences | News

© 2021-2022 Indian Academy of Sciences, Bengaluru.