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      https://www.ias.ac.in/article/fulltext/jcsc/126/04/1135-1141

    • Keywords

       

      Ion recognition; copper sensor; hydroxynapthylidene derivative of hydrazine; heterocycle; fluorescence quenching.

    • Abstract

       

      2-Hydroxynaphthylidene derivatives of hydrazine, namely L1, L2 and L3, were synthesized by going through two-step reactions and the products were characterized. The ion recognition properties of these receptors were studied using fluorescence and absorption spectroscopy. The receptors were found to be sensitive and selective towards Cu2+ in methanol solution among the 13 metal ions studied, namely Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+, Pb2+, Na+, K+, Ca2+ and Mg2+, by exhibiting switch off fluorescence. The stoichiometry of the complexed species was found to be 2:1. The fluorescence quenching with Cu2+ is in the order of L1 > L2 > L3. These conjugates were also found to act as colorimetric sensors for Cu2+ in solution by exhibiting visual colour change. The 2:1 complex shows a centrosymmetric structure based on DFT computations.

    • Author Affiliations

       

      Jayaraman Dessingiou1 Jayshree K Khedkar1 Chebrolu P Rao1

      1. Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076 India
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