Selected cyanines bearing quaternary azaaromatic moieties are presented, showing their monomers, dimers and polymers, as well as their possible applications. Cyanines having NLO properties are also briefly described.
A new poly(p-phenylenedivinylene) oligomer 2,2'-(1,4-phenylenedivinylene)bisquinoxaline, a promising candidate in organic electroluminescent devices, was synthesised via a Knoevenagel condensation reaction of 2-methylquinoxaline with 1,4-benzenedicarbaldehyde. The same synthetic strategy was applied to obtain substituted styryl dyes, derivatives of quinoxaline, whereas styryl derivatives of quinoline were prepared by "Anil Synthesis". The considered dyes are of interest as fluorescence emitting materials.Organic compounds used as electroluminescent materials can be divided into two major classes, the first one is based on low molecular weight compounds like fluorescent dyes and metal chelates, and the second one involves polymeric materials [1]. The nitrogen/oxygen-containing π-electron deficient heterocycles such as oxadiazoles, triazoles, triazines, pyridines, pyrimidines, quinolines, and quinoxalines are potential candidates for ETL (electron-transporting layer) materials [2]. Polyquinoxalines (PQxs), for example, combine advantageous features such as high electron affinity, good thermal stability, and good processability with sufficiently low refractive indices [3]. Due to their chemical structure PQxs have been utilized as electron n PPV
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