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−, H2PO4−, Cl−, Br−, I−, ClO4−, HSO4− and PF6−. The toxic CN− and F− ions interact selectively with the –OH protons of 1 as established via 1H 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.