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The synthesis and characterization of novel coumarin-containing cyanine dyes via "Click" chemistry

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Four novel cyanine dye derivatives (C-Cy(1–4)) in which a coumarin moiety is attached to benzoindole ring of asymmetric trimethine cyanine dyes or hemicyanine dye by 1,2,3-triazole have been successfully synthesized via "Click" reaction between the corresponding alkyl-end cyanine dyes and 3-azidocoumarin. Six reaction systems were employed to find the suitable "Click" conditions of cyanine dyes. It was found that the combination of DMF, CuI and di-i-propylethylamine (DIPEA) was the most excellent system for "Click" reaction. All of the compounds were characterized by 1H-NMR, MS, UV and FL.

Affiliations: 1: Lab for Advanced Materials & Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, P. R. China


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