Spectroscopic detection of metals ions using a novel selective sensor

Abstract

Colorimetric chemosensors are simple, economical and practical optical approach for detecting toxic metal ions (Hg 2+ , Pb 2+ , Ni 2+ , etc.) in the environment. In this work, we present a simple but highly specific organic compound 4-chloro-2-((E)-((E)-3-(4-(dimethylamino)phenyl)allylidene)amino)phenol (L1) that acts as a colorimetric sensor for divalent metal ions in H 2 O. The mechanism of the interaction between L1 and various metal-ions has been established by UV-vis absorption and emission spectroscopic experiments that indicate favorable coordination of metal ions with L1 in different solvents. Experimental results indicate that the shape of the electronic transition band of L1 (receptor compound) changed after the interaction with divalent metal-ions, such as Hg 2+ , Pb 2+ , Mn 2+ , Co 2+ , Cu 2+ , and Ni 2+ in aqueous solution. We found that L1 have a considerable selectivity for Ni 2+ ions, even in presence of other metals ions when mixtures of DMSO/H 2 O as are used as solvents. L1, which has been targeted for sensing transition metal ions, exhibits binding-induced color changes from yellow to pink observed even by the naked eye in presence of Ni 2+ ions.

A selective naked-eye chemosensor derived from 2-methoxybenzylamine and 2,3-dihydroxybenzaldehyde - synthesis, spectral characterization and electrochemistry of its bis-bidentates Schiff bases metal complexes

“…Consequently, these chemosensors have been widely investigated for their fundamental role in environmental, analytical and biological applications [13][14][15]. As a consequence, the designing and the synthesizing chemosensors that can detect certain metal ions such as the bivalent ones : Ni 2+ , Cu 2+ , Mg 2+ , Hg 2+ , Mn 2+ , Co 2+ [16][17][18][19][20][21], or the trivalent cations such as Fe 3+ , Mn 3+ and Al 3+ [22,23] with high selectivity and sensitivity were induced by most studies in the literature.…”