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Luminescent coordination-driven supramolecular assemblies based on pre-organized Cu(I) precursors stabilized by main-group element ligands

Subject Area Inorganic Molecular Chemistry - Synthesis and Characterisation
Term from 2020 to 2024
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 446028511
 
Final Report Year 2024

Final Report Abstract

Given the deficit of inexpensive and luminescent materials from compounds containing abundant elements as for instance copper, this ANR-DFG SUPRALUM project targeted the preparation and the study of the multifunctional luminescence properties of a large series of new discrete and polymeric polymetallic Cu(I)-based supramolecular assemblies. These new inexpensive and stable derivatives possess unprecedented architectures that include enhanced solid-state luminescence properties, which establish them as a very appealing source of new multifunctional molecular materials incorporating both lighting and sensor applications. A combination of experimental and computational modeling was conducted to integrate fundamental understanding and potential technological applications from coordination chemistry, supramolecular chemistry, main group element chemistry, photophysics and materials science into this project. To do so, specific synthetic methods and complementary characterization skills of the French and German teams were combined. This includes the innovative use of coordination-driven adaptive supramolecular chemistry applied to flexible and pre-assembled Cu(I) precursors as well as the integration of polytopic ligands (e.g. ligands combining main group elements such as phosphorus and arsenic) including flexible polytopic connector ligands. Moreover, the influence of the Weakly Coordinating Anions (WCAs) as counterions on the creation of supramolecular aggregates as well as their influence on the luminescent properties was extensively studied. This synergy made it possible to introduce luminescence properties specific to the synthesized derivatives. In particular, irreversible transitions – activated by temperature – of the solid-state luminescence properties of novel series of compounds have been obtained, opening the way to new fields of application for these photoactive derivatives based on Cu(I) ions. Extensive photophysical studies as well as state-of-the-art theoretical calculations were carried out to characterize and rationalize the electronic processes underlying the new materials obtained.

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