Facile Synthesis of Nitrovanillin‐ Appended Porphyrin and Its Utilization as Potent, Recyclable, Naked‐Eye CN − and F − Ion Sensor

Nitrovanillin porphyrin ( 1 ) was synthesized in good yield and successfully utilized as colorimetric, naked‐eye sensor for toxic CN − and F − ions. The synthesized probe detects CN − and F − ions via anion induced deprotonation, which brings about drastic spectral and colorimetric changes, among the commonly known anions such as OAc − , H 2 PO 4 − , Cl − , Br − , I − , ClO 4 − , HSO 4 − and PF 6 − . The toxic CN − and F − ions interact selectively with the –OH protons of 1 as established via 1 H NMR, UV‐Visible and fluorescence spectroscopic methods. The sensor could detect F − ions ∼1.1 ppm and CN − ions ∼ 1.34 ppm which is very appreciable and promising.