Abstract
AbstractA tripodal pentadentate mono‐imine derivative, 2‐({2‐[bis‐(2‐amino‐ethyl)‐amino]‐ethylimino}‐methyl)‐phenol (L2) is employed for ‘turn on’ fluorescence recognition of Zn2+and Al3+at two different wavelengths. Chelation‐enhanced fluorescence (CHEF) assisted inhibition of excited‐state intramolecular proton transfer (ESIPT) is proposed as the sensing mechanism. The1HNMR, mass, IR spectral data, Jobs experiment and single crystal X‐ray structure of the [Ni(II)‐L2] complex (N1) strongly support the structure of L2 and its interaction with Zn2+and Al3+. Density functional theoretical (DFT) studies indicate higher stability of the Zn2+and Al3+adducts over free L2. The recognition of Zn2+and Al3+at two different emission wavelengths allows to construct a binary logic gate. Moreover, L2 is useful for determination unknown concentration of Al3+in real water samples. The complex N1 catalyses the catechol oxidation reaction.
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