Supramolecular "soft" assemblies based on copper (I) coordination complexes

Szerb Elisabeta I. and Cretu Carmen and Andelescu Adelina Antonia and Cseh Liliana and Costisor Otilia: Supramolecular "soft" assemblies based on copper (I) coordination complexes.

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Copper(I) coordination complexes with N^N chelating oligopyridines are valuable candidates for applications in solar energy conversion1 or lightning technologies2 because of their excellent photophysical and photochemical properties and for the low cost and ready availability of the metal. The most attractive systems are based on ligands able to stabilise their tetrahedral geometry (D2d symmetry) and to hinder the flattening distortions which facilitates oxidation to Cu(II) species.3 Herein we present the synthesis and characterisation of new stable Cu(I) complexes based on functionalised 2,2’-biquinoline ligands (Figure 1) that self-assemble into “soft” supramolecular architectures. The stoichiometry and purity of all compounds were determined using elemental analyses, Atomic Absorption, IR and 1H NMR spectroscopies. The functionalisation of the biquinoline ligand with long alkyl chains yielded thermotropic liquid crystalline systems (CuL1_X and CuL2_X), whereas insertion of hydrophilic groups promoted the assembly in water into supramolecular aggregates (CuL3_X). The thermal behaviour of complexes CuLn_X with n = 1 and 2 was investigated by polarized optical microscopy (POM) and differential scanning calorimetry (DSC). UV-Vis studies on CuL3_X evidenced the presence of supramolecular aggregates in water. Stabilization of Cu(I) systems can be also achieved by building supramolecular assemblies and thus blocking the fluxional process towards a distorted “Cu(II)-like” geometry in concentrated solution of complexes.

Item Type: Conference or Workshop Item
Journal or Publication Title: Proceedings of the International Symposium on Analytical and Environmental Problems
Date: 2017
Volume: 23
ISBN: 978-963-306-563-1
Page Range: pp. 8-9
Event Title: International Symposium on Analytical and Environmental Problems (23.) (2017) (Szeged)
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Uncontrolled Keywords: Kémia - előadáskivonat
Additional Information: Bibliogr.: 9. p. ; összefoglalás angol nyelven
Date Deposited: 2018. Dec. 13. 12:17
Last Modified: 2022. Aug. 08. 15:49

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