Abstract
2,3-Dicyano-5-(4-ethynyl phenyl)-6-(4-alkoxy phenyl) pyrazines ( 10) were synthesized by the condensation reaction of diaminomaleonitrile(DAMN) with 1-(4-alkoxy phenyl)-2-(4-ethynyl phenyl) ethanediones ( 9). And the coupling reaction of 1,3,3-trimethyl-6′-iodo-spiro [2 H-benzopyran-2,2′-indoline] ( 14) with 10 gave the novel 2,3-dicyanopyrazine dyes ( 15) containing a spiropyran group. Compounds 15 had emission at 484 nm in chloroform solution as well as photochromic properties under UV irradiation. Their characteristics were evaluated by DSC, UV–visible and fluorescence spectroscopy. The combination of different functional dyes such as 2,3-dicyanopyrazines and spiropyran was successfully synthesized.
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