Synthesis and characterization of metallo-supramolecular polymers from thiophene-based unimers bearing pybox ligands. Issue 18 (8th February 2017)

• Record Type: Journal Article
• Authors: Hladysh, Sviatoslav; Václavková, Daniela; Vrbata, David; Bondarev, Dmitrij; Havlíček, David; Svoboda, Jan; Zedník, Jiří; Vohlídal, Jiří
• Is Part Of: RSC advances. Volume 7:Issue 18(2017)
• Page Start: 10718
• Page End: 10728
• Publication Date: 2017-02-08
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra26665g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A series of novel metallo-supramolecular polymers was prepared, based on 2, 6-bis(2-oxazolinyl)pyridine chelating groups bridged with thiophene, bithiophene and thienothiophene as a linker, beginning from commercially available (chelidamic) acid. 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: Fe 2+, Zn 2+, Ni 2+, Cu 2+ . During the self-assembly process of the prepared unimers with a Cu 2+ ion coupler, UV/vis investigation showed the highest shift of absorption maxima to lower energies, contrary to the Fe 2+ ion couplers where the lowest value of shift was detected, compared to the free unimer. Upon the complexation of the Fe 2+ 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 Zn 2+ exhibited a high fluorescence increase with an increase of metal ion concentration. Adversely, all of the other metals only showed fluorescence quenching.