Synthesis and optical properties of push-pull type tetrapyrazinoporphyrazines

The optical properties of push-pull type tetrapyrazinoporphyrazines based on 2,3-dicyanopyrazines were demonstrated. They have alkoxyphenyl substituent as an electron donor group at 5-position, and nitro- or sulfonyl-phenyl substituents as an electron acceptor group at 6-position of 2,3-dicyanopyrazine. The absorption and fluorescence maxima of nitro-substituted compounds were observed at 427-444 and 453-494 nm, respectively. In the case of sulfonyl-substituted compounds, the hypsochromic shift of absorption and fluorescence maxima were 59-104 and 13-79 nm, respectively.