Quinolone based chemosensor for the naked-eye and spectrophotometric detection of Cu2+ in aqueous media

New 4-hydroxy-2-quinolone based chemosensor (BPHTQ-1) was designed for the spectrophotometric and naked-eye detection of Cu2+. Cu2+ recognition furnished with a significant hyperchromic shift at 300 nm. The BPHTQ-1 provided the recognition of Cu2+ ion with a high binding affinity of 19,338 M−1 and a detection limit of 1.39 µM.