A novel fluorescent sensor based on 4-(diethylamino)-2-(hydroxy)-phenyl imine functionalized naphthalimide for highly selective and sensitive detection of CN- and Fe3+

In this work, a novel sensor molecule HB1 based on 4-(diethylamino)-2-(hydroxy)-phenyl imine functionalized naphthalimide derivative was successfully designed and synthesized. Interestingly, the HB1 showed fluorescence identification ability for CN- in DMSO/H2O (8 : 2, v/v) solution. After addition of CN- into the HB1 solution, the fluorescence intensity of HB1 solution could be enhanced obviously. The anti-disturbance experiments demonstrated that other anions couldn’t interfere in the detection of CN-. On the other hand, the HB1 enable dual-channel (absorption and fluorescence) detection of Fe3+ in DMSO solution. With the addition of various metal ions into the HB1 solution, only Fe3+ induced the fluorescence emission of HB1 solution quenching and the color changing, and other metal ions couldn’t interfere in the detection of Fe3+. The LODs (limits of lowest detection) of HB1 for CN- and Fe3+ were 6.30 × 10-8 M and 3.95 × 10-8 M, respectively. Importantly, the real samples experiment was carried out by detecting CN- in bitter almonds. Meanwhile, ion test strips based on HB1 were fabricated, which could act as convenient and efficient test kits for detecting CN- and Fe3+.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author