Add time:08/09/2019         Source:sciencedirect.com

Quinoxaline based azine derivatives (NN1 and NN2) were synthesized from ninhydrin and sensing studies of the receptors were performed with various cations and anions. NN1 and NN2 showed highly selective colour change from orange/yellow to violet/blue respectively for copper ions. Bathochromic shifts of n-π* band of the receptor to d-d transition band of the Cu2+ complex were observed in both the cases. Since anions do not have any straight effect over the receptors, we tried the relay recognition with the copper-receptor in-situ solution with anions. Interestingly, iodide ions selectively regenerated the receptors. It is inferred from the interference studies that no anions have interference over sensing behaviour of the relay recognition of iodide. The receptors showed good binding constants and micromolar detection limit with 1:2 stoichiometric ratio of copper(II) and 1:4 of iodide ions. The relay recognition was selectively applied to quantify iodide ions in common salt and rock salt.

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