Luminescent Mono‐, Di‐ and Trisubstituted 2,4,6‐Triphenylpyridine‐Based Molecules: Synthesis and Properties

Abstract

The chromophores based on a pyridine central acceptor and one/two/three peripheral substituents of different electronic and spatial nature have been designed and synthesized. The structure‐property relationship was studied using differential scanning calorimetry, cyclic voltammetry, UV‐Vis and emission spectroscopy. A study of the thermal properties of the synthesized compounds showed that the presence of a 3,6‐bis(tert‐butyl)carbazole fragment leads to a significant increase in the glass transition temperature of the compounds. Photophysical studies have revealed that N,N‐diphenylamine‐containing pyridines are characterized by a high fluorescence quantum yield. In this regard, the expediency of the simultaneous presence in the structure of chromophores of electron‐donating groups of different natures has been proven, since this approach makes it possible to obtain compounds with high fluorescence quantum yield and molar absorption coefficient, as well as a narrow band gap and a deep level of the highest occupied molecular orbital.