Bhattacharyya Bhaswati, Kundu Arijit, Guchhait Nikhil, Dhara Kaliprasanna
Department of Chemistry, Government Girls' General Degree College, Kolkata, -700013, India.
Department of Chemistry, Maulana Azad College, Kolkata, -700013, India.
J Fluoresc. 2017 May;27(3):1041-1049. doi: 10.1007/s10895-017-2038-x. Epub 2017 Feb 9.
Novel anthraimidazoledione-based compounds (1-3) are synthesized as selective colorimetric and fluorescent sensors for fluoride ion. The binding properties of the probes (1-3) are studied with different anions in acetonitrile solvent. Spectral red shifts in the absorption spectra and 'turn-off' emission are observed when fluoride is added to 1-3. The striking green to orange color change in the ambient light is thought to be due to the deprotonation of the N-H proton of the imidazole moiety of the probes by the basic F ion. Interestingly, in all three cases the nonfluorescent probe-F solutions, on treatment with copper perchlorate, show distinct color change from orange to golden yellow with resumption of fluorescence intensity. Furthermore, the reversibility of sensors (1-3) for the detection of F ion is tested for four cycles indicating that "ON-OFF-ON" mechanism is operative. Test strip based on sensor 2 acts as a reusable cost-effective F sensor.
合成了基于新型蒽咪唑二酮的化合物（1-3）作为氟离子的选择性比色和荧光传感器。在乙腈溶剂中研究了探针（1-3）与不同阴离子的结合特性。当向1-3中加入氟化物时，观察到吸收光谱中的光谱红移和“关断”发射。环境光中显著的绿色到橙色的颜色变化被认为是由于碱性F离子使探针咪唑部分的N-H质子去质子化所致。有趣的是，在所有三种情况下，用高氯酸铜处理非荧光探针-F溶液时，溶液颜色从橙色变为金黄色，同时荧光强度恢复。此外，测试了传感器（1-3）对F离子检测的可逆性，进行了四个循环，表明“开-关-开”机制起作用。基于传感器2的测试条可作为一种可重复使用的经济高效的F传感器。
