SYNTHESES AND CHARACTERIZATION OF PUSH-PULL TETRAPYRAZINO[2,3-B]INDOLOPORPHYRAZINES

The ring-closure reactions of 2,3-dichloro-5,6-dicyanopyrazine with en amines are useful methodologies to extend the pi-conjugation system gi ving new heterocycles. The synthesis and characterization of tetrapyra zinoindoloporphyrazines from 2,3-dichloro-5,6-dicyanopyrazine are desc ribed. Alkylpyrazinoindoloporphyrazines have push-pull intramolecular charge-transfer chromophoric systems and have good solubility in most organic solvents. Large spectral changes caused by molecular aggregati on of these dyes affected by solvent polarity and temperature were stu died.