“…Fluorescent sensors based on small molecules, in particular, have significant advantages such as their exquisite and noninvasive size, high sensitivity, selectivity, and fast response time. To date, numerous fluorescent Hg 2+ ( Chen, et al, 2015 ; Kim, et al, 2012 ) probes have been reported based on varieties of fluorophore like Rhodamine ( Bera, et al, 2014 ; Chang, et al, 2018 ; Su, et al, 2017 ; Tang, et al, 2017 ; Zhao, et al, 2010 ), BODIPY ( Hatai, et al, 2012 ; Lu, et al, 2009 ; Yoon, et al, 2005 ), Coumarin ( Sie, et al, 2017 ; Puthiyedath and Bahulayan, 2018 ), Schiff base ( Chen, et al, 2018 ; Duan, et al, 2019 ; Sarkar, et al, 2016 ; Wang, et al, 2018b ; Wang, et al, 2018d ; Zhang, et al, 2017 ), AIE luminophore ( Chen, et al, 2017 ; Selvaraj, et al, 2021 ; Wang, et al, 2018a ), Peptide-based benzoxazole unit ( Oliveira, et al, 2011 ; Oliveira, et al, 2013 ), etc. These probes were usually prepared either through the complexation with the multiple binding sites or through a chemical reaction with the proper functional group onto fluorescent molecules.…”