Flourogenic Chemo-Sensor-Based Sensing of Heavy Metal ion by Using Gold Coated Lower Rim Amino Functionalized Calix [4] arene

In recent years, there has been increasing ecological and global public health concern associated with heavy metal ions even at lower concentration. These heavy metals are non-biodegradable and remain in the ecological system and food chain system at high levels of pollution. The chemical recognition of heavy-metal ions is the base for the mentioned techniques to enable a proper sensing through specific substances/species called receptors of the Fluorogenic chemo-sensor. So Fluorogenic chemo-sensor sensing technique having high reliability and sensitivity for analysis of target non biodegradable heavy metal ions detection by utilizing Gold Nanoparticles (AuNPs) surface coated with calix [4]arene amine derivative. Signaling event of chemo-sensor after binding with analyte of interest was characterized by 1H NMR, Fourier-transform infrared spectroscopy (FTIR), Photo luminescence (PL) and Transmission electron microscope (TEM) analysis. Calix [4]arene amine derivative capped gold nanoparticle (C [4]A3@AuNPs) in Tetrahydrofuran (THF) dispersible at low pH with specific size and zeta potential of 50±2 MeV make these nanoparticle has potential for various application. Calix [4]arene amine derivative capped gold nanoparticle (C [4]A3@AuNPs) were found to be fluorometric sensor for Zn2+ metal ion among these metal ions i. e. Li+, Zn2+, Ni2+, Ba2+, Cr3+, Which can detected at very low concentration level of 1 µM in facile way of fluorescence quenching via colorimetric sensor relies real time quantitative detection of Zn2+metal ion with detection limit of 1.5×10-6 M.