A Turn‐On Chromogenic and Fluorogenic 2‐Aminobenzophenyl‐Isoniazid Sensor for Selective Detection of Cu2+ Ions in Water Samples and Vegetables

Abstract

AbstractA novel 2‐aminobenzophenyl‐isonazid (BPNH) was developed for Turn‐On green emissive sensor for Cu2+ ions. The probe is highly selective to Cu2+ ions in presence of interfering heavy metals. The presence of acid hydrazide and amine group facilitate the strong interaction of the probe with Cu2+ ion. The optical spectral investigation of the probe (E)‐N′‐((2‐aminophenyl)(phenyl)methylene)isonicotinohydrazide (BPNH) with Cu2+ ions showed Intramolecular Charge Transfer (ICT) process and Ligand‐Metal Charge transfer (LMCT) are responsible for fluorescence Turn‐On emission. The ensemble BPNH+Cu2+ is reversible with addition of S2− ions. The sensor BPNH displayed a lowest detection limit, DL=8.32×10−7 M (nanomolar). The real sample analysis application of the ligand BPNH for Cu2+ quantification has been demonstrated with water samples collected from various sources and vegetable extracts.