An optical probe 1 has been synthesized comprising naphthalimide unit conjugated with Schiff base, exhibiting excited state intramolecular proton transfer and intramolecular charge transfer as a potential sensor for Al³⁺ and F⁻ ions using standard spectroscopic techniques. The probe 1 exhibited local and charge-transfer excitation at 340 nm and 460 nm, respectively. On excitation at 460 nm, probe 1 displayed two emission bands at 510 nm and 610 nm, accompanied by Stokes‘ shift of 50 nm and 150 nm, respectively. The solvatochromic effect and theoretical calculation depicted that the representative emissions resulted from the ESICT/ESIPT phenomenon. Upon addition of Al³⁺ ions, the charge transfer excitation at 460 nm was enhanced ratiometrically to local excitation at 340 nm and showed a color change from orange to yellow. Similarily, probe 1.Al³⁺ displayed emission enhancement at 540 nm in H₂O/CH₃CN (1:9; v/v) and showed a color change from yellow to blue-green emission. Following the detection of Al³⁺ ions, hydrolysis of probe 1 to its reacting precursors was observed. The detection of Al³⁺ ions was also demonstrated in surfactant-containing water. The limit of detection (LOD) of probe 1 (H₂O/CH₃CN (1:9; v/v)) towards Al³⁺ ions was measured to be 3.2 × 10⁻⁸ M. The probe 1 displayed a ratiometric absorption response towards F⁻ ions with a new peak at 570 nm and showed a color change from orange to purple. The probe 1.F⁻ displayed a decrease in emission at 635 nm. The LOD of probe 1 (CH₃CN) towards F⁻ ions was measured to be 7.5 × 10⁻⁷ M.

光学探针1已经合成包括具有希夫碱缀合萘酰亚胺单元，表现出激发态分子内质子转移和分子内电荷转移作为铝电位传感器³⁺和F ^-使用标准光谱技术离子。探针1分别在340nm和460nm处表现出局部和电荷转移激发。在460 nm激发时，探针1在510 nm和610 nm处显示两个发射带，并伴随斯托克斯位移分别为50 nm和150 nm。溶剂变色效应和理论计算表明，代表性排放源于ESICT / ESIPT现象。添加Al ^3+后离子，在460 nm处的电荷转移激发与在340 nm处的局部激发成比例地增强，并显示出从橙色到黄色的颜色变化。同样，探针1 .Al ³⁺在H ₂ O / CH ₃ CN（1：9; v / v）中在540 nm处显示出发射增强，并且显示出从黄色到蓝绿色发射的颜色变化。在检测到Al ³⁺离子后，观察到探针1水解为其反应前体。还证明了在含表面活性剂的水中检测到Al ³⁺离子。探针1（H ₂ O / CH ₃ CN（1：9; v / v））对Al ³⁺的检测极限（LOD）离子测定为3.2×10 ^-8 M的探头1显示对F A比率的吸收响应^-离子与一个新的峰在570nm和表明从橙色到紫色的颜色变化。探头1 .F ^-显示在635nm处排放的降低。探针的LOD 1（CH ₃ CN）朝着˚F ^-离子测定为7.5×10 ^-7 M.