An ionic-based carbon dot for enantioselective discrimination of nonaromatic amino alcohols
Here, an ionized chiral carbon dot (S,S)-C-dots-1 (λex = 430 nm, λem = 480 nm) is synthesized via facile route with relatively high quantum yield (~24.4%) and carried out as the fluorescent chiral sensor. During the synthetic process, one of the advantages is that the established strategy can avoid the loss of chiral center. That is, chiral bromo compound can directly form ionic pair with the pyridyl group, which is derived from the amine precursor in the first step. Furthermore, it is found that (S,S)-C-dots-1 has clear discrimination toward different configurations of nonaromatic amino alcohols in the presence of Cu(II). When (R)-isomer is added to the (S,S)-C-dots-1 + Cu(II) solution, it shows much higher fluorescent intensity than (S)-isomer. The values of IR/IS are 2.9 and 2.3 for 2-aminobutan-1-ol and 2-aminopropan-1-ol, respectively. In brief, we believe that this work can expand the synthetic route and explore the potential of functional carbon dots in the field of enantioselective sensing.