10.1021/jp407623u
The research investigates the properties of two series of azines and their azomethine analogues synthesized via condensation reactions. The purpose is to explore their potential applications in optoelectronics. Key chemicals used include benzaldehyde, 2-hydroxybenzaldehyde, 4-pyridinecarboxaldehyde, 2-thiophenecarboxaldehyde, and 4-(diphenylamino)benzaldehyde, reacted with hydrazine monohydrate and 1,4-phenylenediamine. The compounds were characterized using FTIR, NMR, and elemental analysis, while their properties were studied using DSC, UV–vis spectroscopy, photoluminescence spectroscopy, and cyclic voltammetry. The research concluded that azines and azomethines exhibit distinct thermal, optical, and electrochemical properties influenced by their chemical structure. Azines generally have higher melting points and lower LUMO levels compared to their azomethine analogues. The azomethines show better solubility and processability, making them more suitable for certain optoelectronic applications. The study also found that protonation with HCl can enhance the photoluminescence intensity of these compounds, suggesting potential for tuning their properties for specific uses.