A versatile chemosensor 1 (E)-2-(((8-hydroxy-2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-9-yl)methylene)amino)-1H-benzo[de]isoquinoline-1,3(2H)-dione, based on naphthalimide and julolidine moieties, was developed for highly distinguishable and selective recognition of Group IIIA metal ions (Al³⁺, Ga³⁺ and In³⁺). Sensor 1 exhibited significant ‘off–on’ fluorescence responses at 488 nm in the presence of Al³⁺ and at 570 nm in the presence of Ga³⁺ and In³⁺. The same emission of Ga³⁺ and In³⁺ could be distinguished through different color changes (from colorless to yellow for Ga³⁺ and no color change for In³⁺). Binding constants of 1 for Ga³⁺ and In³⁺ are the highest reported to date for an organic chemosensor. A 2 : 1 binding mode between 1 with Al³⁺, Ga³⁺ and In³⁺ is proposed based on electrospray ionization mass spectrometry, Job plot analysis, and theoretical calculations.

中文翻译：

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多功能选择性“开启”荧光化学传感器，用于检测IIIA组离子Al ³⁺，Ga ³⁺和In ³⁺ †

多功能化学传感器1（E）-2-（（（（8-hydroxy-2,3,6,7-tetrahydro-1 H，5 H -pyrido [3,2,1- ij ]] quinolin-9-yl）methyl ）氨基）-1 H-苯并[ de ]异喹啉-1,3（2 H）-二酮，基于萘二甲酰亚胺和朱洛力定部分，是为高度区分和选择性识别IIIA族金属离子（Al ³⁺，Ga ^{3 +}和In ³⁺）。传感器1在存在Al ³⁺的情况下在488 nm和在Ga ³⁺和In ³⁺的情况下在570 nm处显示出明显的“开-关”荧光响应。。Ga中相同的发射³⁺和In ³⁺可以通过不同颜色的变化（从无色到黄色为镓来区分³⁺和用于在没有颜色变化³⁺）。Ga ³⁺和In ^3+的结合常数为1，是迄今为止有机化学传感器的最高结合常数。A 2：1之间结合模式1有Al ³⁺，镓³⁺和In ³⁺是基于电喷雾电离质谱，作业图分析，和理论计算提出。