摘要
There has not been any report on crown other cyanine dyes up to now. The authors succeeded in synthesizing 2-methyl-5,6-(15 erown-5) benzothiazole (Ⅰ), then 2-methyl-3-ethyl-5, 6-(15-crown-5)- benzothiazolium iodide (Ⅱ) and finally 3, 3′-diethyl-5, 6, 5′, 6′-bis-
