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Issue 18, 2017
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Synthesis and characterization of metallo-supramolecular polymers from thiophene-based unimers bearing pybox ligands

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Abstract

A series of novel metallo-supramolecular polymers was successfully prepared, based on 2,6-bis(2-oxazolinyl)pyridine building blocks consisting of pyridine flanked by two oxazoline rings as a tridentate binding site bridged with thiophene, bithiophene and thienothiophene as a linker, beginning from a cheap and commercially available 1,4-dihydro-4-oxo-2,6-pyridinedicarboxylic (chelidamic) acid. Metallo-supramolecular polymers were obtained and spectroscopically characterized upon treatment of the synthesized building blocks, also known as unimers, with the following metal ions: Fe2+, Zn2+, Ni2+, Cu2+. During the self-assembly process of the prepared unimers with a Cu2+ ion coupler, UV/vis investigation showed the highest shift of absorption maxima to lower energies, contrary to the Fe2+ ion couplers where the lowest value of shift was detected, compared to the free unimer. Upon the complexation of the Fe2+ ion coupler with selected unimers, the appearance was observed of new absorption bands around 600 nm ascribable to metal-to-ligand charge-transfer transitions. The luminescence study of the complexation of the synthesized unimers with Zn2+ exhibited a high fluorescence increase with an increase of metal ion concentration. Adversely, all of the other metals only showed fluorescence quenching.

Graphical abstract: Synthesis and characterization of metallo-supramolecular polymers from thiophene-based unimers bearing pybox ligands

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Supplementary files

Article information


Submitted
11 Nov 2016
Accepted
27 Jan 2017
First published
08 Feb 2017

This article is Open Access

RSC Adv., 2017,7, 10718-10728
Article type
Paper

Synthesis and characterization of metallo-supramolecular polymers from thiophene-based unimers bearing pybox ligands

S. Hladysh, D. Václavková, D. Vrbata, D. Bondarev, D. Havlíček, J. Svoboda, J. Zedník and J. Vohlídal, RSC Adv., 2017, 7, 10718
DOI: 10.1039/C6RA26665G

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