Bharat K Sharma
Articles written in Journal of Chemical Sciences
Volume 127 Issue 9 September 2015 pp 1571-1579
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.
Volume 127 Issue 11 November 2015 pp 2063-2071 Articles
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.
Volume 134, 2022
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