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Issue 33, 2019
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A macrocyclic tetranuclear ZnII complex as a receptor for selective dual fluorescence sensing of F and AcO: effect of a macrocyclic ligand

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Abstract

A 48-membered macrocyclic ZnII-Schiff base complex DAS (Dual Anion Sensor) containing protonated imine has been synthesized and characterised. The single crystal X-ray structural analysis reveals a tetranuclear complex cation [Zn4(LH3)(NO3)5]2+ counterbalanced by a [Zn(NO3)4]2− anion. DAS acts as a dual anion sensor which can selectively detect fluoride and acetate in aqueous methanolic solution by change in UV-vis spectra as well as by fluorescence enhancement. A probable mechanistic pathway has been proposed and DFT calculations corroborate well with the experimental data. The calculated limit of detection for F and AcO ions was 0.18 and 1.98 μM, and 0.15 and 1.8 μM from UV and FL data, respectively. Interestingly, DAS behaves as an INHIBIT logic gate with F/AcO and H+ as inputs. To the best of our knowledge, this is the first example where a macrocyclic Zn-complex serves as an INHIBIT logic gate. Practical utility of DAS has been explored by successful detection of F in commercially available toothpaste as well as solid state detection of F and AcO.

Graphical abstract: A macrocyclic tetranuclear ZnII complex as a receptor for selective dual fluorescence sensing of F− and AcO−: effect of a macrocyclic ligand

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Supplementary files

Article information


Submitted
05 Jul 2019
Accepted
23 Jul 2019
First published
23 Jul 2019

New J. Chem., 2019,43, 13152-13161
Article type
Paper

A macrocyclic tetranuclear ZnII complex as a receptor for selective dual fluorescence sensing of F and AcO: effect of a macrocyclic ligand

T. Chakraborty, S. Dasgupta, A. Bhattacharyya, E. Zangrando, D. Escudero and D. Das, New J. Chem., 2019, 43, 13152
DOI: 10.1039/C9NJ03481A

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