The spectroscopic and computational study of anthracene based chemosensor - Ag⁺ interactions

Here in, we demonstrate a selective detection of Ag⁺ ion by the anthracene-based schiff base sensor AMC. The recognition event among sensor AMC and Ag⁺ ion was investigated by enhanced absorption band, red-shifted quenched emission spectra, electrochemical studies and DFT computational studies. The presence of Ag⁺ ion to solution of AMC quenched almost 50 % emission intensity of the ligand band. Data from high-resolution electrospray ionization mass spectrometry (ESI-HRMS), Ag⁺ titrations, and Job's plot studies all show that Ag⁺ binds to AMC in a 1:1 stoichiometric ratio.The quantitative parameters of sensor for silver ion are determined as the limit of detection (LOD) 5.95 × 10^-7 M, and limit of quantitation (LOQ) 1.98 × 10^-8 M in the linear range 3.48-20.31 × 10^-6 M with good association affinity of 5.030 × 10³ M^-1. LMCT phenomenon from insilico studies, is in good agreement with the results obtained from other performed spectroscopic techniques. In addition, this sensor AMC was also successfully applied to real water samples for the identification and measurement of Ag⁺ ions.