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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/152521
Ternary assemblies comprising metal-salophen complexes and 4,4-bipyridine
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Two series of ternary assemblies comprising metal-salophen [salophen = N,N′-phenylenebis(salicylideneimine)] complexes (M = Zn2+ or UO22+) and 4,4′-bipyridine have been synthesized. Their absorption and emission data have been compared with those of the corresponding mononuclear derivatives. The dinuclear zinc species present lower emission intensities than those corresponding to the mononuclear precursors, while the emission of the analogous uranyl complexes is observed to increase. Absorption and emission titrations indicate that the ternary species are obtained in two independent coordination steps. The important role of the electron donating/withdrawing properties of the substituents is analyzed regarding their photophysical properties and the association constants. A MLCT transition (recorded by emission spectra) is expected and supported by the increase in the emissive properties of the complexes containing the higher electron donating substituent (methoxy). Nevertheless, this electron donating character disfavors the coordination to bipyridine as shown by the lower calculated association constants. DFT calculations have been performed on the zinc derivatives in order to estimate the relative stability of the dinuclear complexes.
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SABATÉ, Ferran, et al. Ternary assemblies comprising metal-salophen complexes and 4,4-bipyridine. New Journal of Chemistry. 2016. Vol. 40, num. 5714-5721. ISSN 1144-0546. [consulted: 10 of June of 2026]. Available at: https://hdl.handle.net/2445/152521