SYNTHESES AND SPECTRAL PROPERTIES OF YANO-5,10-DIHYDRODIPYRAZINO[2,3-B-2',3'-E]PYRAZINE

Base catalized intermolecular cyclization of 2-amino-3-chloro-5,6-dicy anopyrazines gave ano-5,10-dihydrodipyrazino[2,3-b:2',3'-e]pyrazines 1 1-20. These compounds have rather small molecular size but have strong intramolecular charge-transfer chromophoric system. They have strong fluorescence in solution and some have fluorescence even in the solid state which are very important to evaluate their electroluminescence p roperty as an emitter for electroluminescence devices. The physical, s tructural, and electronic properties of these new cyano-5,10-dihydrodi ppazino[2,3-b:2'3'-e]pyrazines were studied using uv-visible spectrosc opy and the Pariser-Parr-Pople molecular orbital calculation method.