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For efficiently measuring copper (II) ions in the acidic media of white wine, a new chemosensor based on rhodamine B coupled to a tetraazamacrocyclic ring (13aneN 4 CH 2 NH 2 ) was designed and synthesized by a one-pot reaction using ethanol as a green solvent. The obtained chemosensor was characterized via NMR, UV and fluorescent spectra. It was marked with no color emission under neutral pH conditions, with a pink color emission under acidic conditions, and a magenta color emission under acidic conditions where copper (II) ions were present. The sensitivity towards copper (II) ions was tested and verified over Ca 2+ , Ag + , Zn 2+ , Mg 2+ , Co 2+ , Ni 2+ , Fe 2+ , Pb 2+ , Cd 2+ , Fe 3+ , and Mn 2+ , with a detection limit of 4.38 × 10 -8 M in the fluorescence spectrum.

A New pH-Dependent Macrocyclic Rhodamine B-Based Fluorescent Probe for Copper Detection in White Wine