).
[35,36]. In bimolecular liquid systems, the fluorescence intensity is hindered due to several mechanisms, such as static and dynamic quenching, excimer and exciplex formation, charge transfer, energy transfer process, etc. [37–41]. Based on the results of ESI-MS (Supporting Information, Fig. S5) and Job’s plot (Fig. 3), Cu2 þ bound to RhB-Im in the aqueous acetate buffer/DMF solution, forming a 1:1 stoichiometric complex