Abstract
A 9-(diphenylmethylene)fluorene-based diamidine 1 has been designed and synthesized for the detection of dicarboxylic acids as a “turn-on” fluorescence sensor. The obtained diamidine 1 itself does not show any fluorescence, but a blue fluorescence was observed after the addition of pimelic acid 3e (n = 5) with a high selectivity (does not show a remarkable fluorescence with the addition of other carboxylic acids) in a DMSO/MeCN/H2O mixed solvent, and also succeeded in the detection of an aqueous solution of pimelic acid 3e. Therefore, higher methylene chain length selectivity toward α,ω-dicarboxylic acids 3 was observed for the 9-(diphenylmethylene)fluorene-based diamidine 1 (detection of only 3e) compared to the tetraphenylethylene (TPE)-based diamidine 1’ (detection of 3c-3h).
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