Schiff base bis(5-nitrosalycilaldehyde)ethylenediamine as colorimetric sensor for fluoride

摘要

Schiff bases are widely investigated to develop novel chemosensors for selective identification and determination of anions. In this communication, we have taken an old but novel Schiff base, bis(5-nitrosalycilaldehyde)ethylenediamine (5-NO2-Salen, L), as a receptor to investigate the binding interaction with different anions such as F-, I-, Cl-, and Br- using spectrophotometric and computational approaches. Addition of anions accelerated the tautomerization process of L. The enolimine form of L interacts through the phenolic-OH by intermolecular hydrogen bond that intensified the color of the receptor, and a significant hyperchromic shift was observed due to the fluoride anion.