Abstract
A new, simple and symmetric thiophene based Schiff base 1 as highly selective and fluorescent sensor for Cu2+ ion detection in aqueous medium over other metal ions has been synthesized. Structure of the receptor 1 was confirmed by single crystal X-ray diffraction and other spectroscopic techniques. Absorption and emission spectra were used to study the cation sensing properties. Receptor 1 displays colorimetric response as yellow to colorless and fluorescence “turn-on” property in presence of Cu2+ ion. Receptor 1- Cu2+ complex show 35 folds higher fluorescence response than that of receptor 1. Binding constant for receptor 1- Cu2+ complex was found as 4.23 × 105 with the detection limit of 0.418 nM. Further the recognition of Cu2+ ion in the living cell was achieved using fluoresce microscope. Theoretical calculations were done to support the above findings.
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