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).

设计并合成了一种基于 9-(二苯基亚甲基) 芴的二脒1，用于检测二羧酸作为“开启”荧光传感器。得到的二脒1本身不显示任何荧光，但在a中加入具有高选择性的庚二酸3e（n = 5）后观察到蓝色荧光（加入其他羧酸不显示显着荧光） DMSO/MeCN/H ₂ O混合溶剂，也成功检测了庚二酸3e的水溶液。因此，对于 9-(二苯基亚甲基)芴基二脒，观察到对 α,ω-二羧酸3 的亚甲基链长度选择性更高1（仅检测到3e ）与基于四苯乙烯 (TPE) 的二脒1'（检测到3c-3h）相比。