Synthesis and Properties of Pyrazino- [2,3-g]quinoxaline Derivatives: Blue and Green Fluorescent Materials with Electron Affinity

Abstract

The title compounds have been synthesized and their optical and electronic properties were surveyed in comparison to those of (1,2,5)thiadiazolo(3,4-g)quinoxaline and benzo(1,2-c:4,5-c')bis((1,2,5)thia- diazole) derivatives. They are blue or green fluorophores with electron affinity due to the fused pyrazine rings. Substitution of the fused pyrazine ring for the fused 1,2,5-thiadiazole one led to red shifts of ca. 50 nm in the fluorescence spectra. The substitution also resulted in an increase of electron affinity in the 14π-electron systems. Using a series of these compounds, red-green-blue (RGB) fluorescent emission was achieved.