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Canthin-5,6-dione is a common structure of the fluorescent natural products amarastelline A and nigakinone. Here, we synthesized various derivatives, and studied their fluorescence properties. The effects of substituent groups at the N3-, 4- and 10-positions were clarified. N3-Substitution influenced the solvent-dependent fluorescent change by modulating tautomerization between canthin-5,6-dione and...
A novel fluorescent sensor for monitoring the change of pH was developed, based on a structure containing two hydroxyl groups that are sequentially deprotonated as the pH is increased: the first deprotonation increases the fluorescence intensity and the second decreases it. Compared with most reported pH sensors that can detect only whether or not the pH is below or above a specific value, our sensor...
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