Synthesis of novel water‐soluble fluorescent coumarins bearing sulphonic and hydroxyl groups |
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| Authors: | Todor Deligeorgiev Teodora Tsvetkova Stanislav Stanimirov |
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| Affiliation: | Faculty of Chemistry, University of Sofia, 1164 Sofia, Bulgaria
Email: toddel@chem.uni‐sofia.bg |
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| Abstract: | Two dihydroxynaphtaldehydes (2,5‐dihydroxynaphtaldehyde and 2,7‐dihydroxynaphtaldehyde) and 2,4‐dyhydroxybenzaldehyde were sulphonated. These intermediates were used in subsequent reactions with 2‐cyanomethylbenzothiazole, 2‐cyanomethylbenzoimidazole and 1‐methyl‐2‐cyanomethylbenzoimidazole to synthesise sulphonated coumarin derivatives. The absorption and steady‐state fluorescence characteristics of the prepared coumarins were studied in ethanol and in water. |
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