Abstract
This review article summarizes the recent advancement of colorimetric and fluorescent detection of dual anions, fluoride and bisulfate. Different small molecule-based fluorophores that have been utilized in the independent and sequence-specific relay (Fluoride followed by bisulfate or vice versa) detection of the dual anions have thoroughly been comprehended chronologically. Since, fluoride is a strong hydrogen bond or proton acceptor and bisulfate is a hydrogen bond or proton donor, hydrogen bonding and proton transfer have a vital role in the dual anions detection. Also, acid-base chemistry acted as the origin of high selectivity recognition of the dual anions. Additionally, the key role of the DFT study and 1H NMR titration to explore and establish binding mechanisms has been highlighted. Moreover, the applications of the chemosensors in the detection of F– and HSO4– anions in real samples have thoroughly been emphasized. Most interestingly, the application of the “Off-On-Off” or “On-Off-On” spectroscopic responses in the decoration of various opto-chemical logic devices and molecular keypad locks was comprehended technically. Hopefully, this review article will provide insight into the optical detection of the dual anions and might be helpful for further advancement.
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