4 years ago

Synthesis and salient chemosensing properties of a new thiazole-azo derivative

Synthesis and salient chemosensing properties of a new thiazole-azo derivative
A new hydroxy-benzene modified thiazole-azo derivative was synthesized and its chemosensing towards heavy metal ions (Na+, Al3+, K+, Ca2+, Mn2+, Fe2+, Ni2+, Cu2+, Zn2+, Ag+, Cd2+, Hg2+ and Pb2+) was characterized by UV–vis spectroscopy. The newly obtained compound produced cation-induced bathochromic shifts for Hg2+ ion more than the other tested metal ions in acetonitrile solution. The interactions with cations were further studied by colorimetric, UV–vis and NMR studies. The presence of the hydroxyl moiety along with the electron rich nitrogen of thiazole ring acting as the binding site and the azo group acting as a signaling unit enables the system to display excellent sensitivity for Hg2+ with a color change from light orange to red purple. The stoichiometric ratio and the association constant for the complex between Hg2+ and the target compound assume the values of 1:1 and 2.1 × 105 mol−1dm3, respectively.

Publisher URL: www.sciencedirect.com/science

DOI: S0040402017308013

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