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Synthesis and fluorescent properties of 2,3-dimethylquinoxaline substituted poly(phenylenevinylene) oligomer via Wittig reaction

R.Padma, S.Guhanathan

Fluorescent heterocyclic compounds are of immense interest as functional materials in the emitters of electroluminescence devices and in the molecular probes used for biochemical research as well as in the traditional textile applications. Organic “-conjugated polymers are much academic and significant technological interest due to their optical and electronic properties. Of these materials, poly(phenylenevinylene)s (PPVs) have attracted the most attention and found greatest utility in electronic devices. In addition, the presence of electron withdrawing N-heterocycles such as pyrazine and quinoxaline rings to be used as electronattracting part in ð-conjugated structures. Poly(p-phenylene vinylene) are one of the most important classes of conjugated polymers, with a wide range of applications, such as light-emitting diodes, optoelectronic devices etc. Hence, the present investigation was devoted to the synthesis of phenylenevinylene oligomer substituted quinoxaline derivatives using 2,3-dimethylquinoxaline with terephthaldicarboxaldehyde via Wittig reaction. The structures of synthesised compounds were confirmed by FTIR, 1H, 13C, 31P-NMR spectral data. The results of fluorescent experiment on the synthesised compound found to exhibit the photoluminescence with bluish green emission maxima at shorter wavelengths of 460nm.