Quinoxaline–Hydrazinobenzothiazole sensor detects four metal ions through distinct chromofluorogenic approach. Ratiometric photophysical profile was observed with a nanomolar detection limit and application in real water sample analyses.

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A novel 2-aminobenzophenyl-isonazid (BPNH) was developed for Turn-On green emissive sensor for Cu 2 + ions. The probe is highly selective to Cu 2 + ions in presence of interfering heavy metals. The presence of acid hydrazide and amine group facilitate the strong interaction of the probe with Cu 2 + ion. The optical spectral investigation of the probe (E)-N'-((2aminophenyl)(phenyl)methylene)isonicotinohydrazide (BPNH) with Cu 2 + ions showed Intramolecular Charge Transfer (ICT) process and Ligand-Metal Charge transfer (LMCT) are responsible for fluorescence Turn-On emission. The ensemble BPNH + Cu 2 + is reversible with addition of S 2À ions. The sensor BPNH displayed a lowest detection limit, DL = 8.32 × 10 À 7 M (nanomolar). The real sample analysis application of the ligand BPNH for Cu 2 + quantification has been demonstrated with water samples collected from various sources and vegetable extracts.