Issue 18, 2017

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

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

Supplementary files

Article information

Article type
Paper
Submitted
11 Nov 2016
Accepted
27 Jan 2017
First published
08 Feb 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 10718-10728

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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