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Controlling Lanthanide Exchange in Triple-Stranded Helicates: A Way to Optimize Molecular Light-Upconversion

Abstract : The kinetic lability of hexadentate gallium-based tripods is sufficient to ensure thermodynamic self-assembly of luminescent heterodimetallic [GaLn(L3)3 ](6+) helicates on the hour time scale, where Ln is a trivalent 4f-block cation. The inertness is, however, large enough for preserving the triple-helical structure when [GaLn(L3)3 ](6+) is exposed to lanthanide exchange. The connection of a second gallium-based tripod further slows down the exchange processes to such an extent that spectroscopically active [CrErCr(L4)3 ](9+) can be diluted into closed-shell [GaYGa(L4)3 ](9+) matrices without metal scrambling. This feature is exploited for pushing molecular-based energy-transfer upconversion (ETU) at room temperature.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01640114
Contributor : Laurent Jonchère <>
Submitted on : Monday, November 20, 2017 - 4:55:31 PM
Last modification on : Friday, July 10, 2020 - 4:21:56 PM

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Davood Zare, Yan Suffren, Homayoun Nozary, Andreas Hauser, Claude Piguet. Controlling Lanthanide Exchange in Triple-Stranded Helicates: A Way to Optimize Molecular Light-Upconversion. Angewandte Chemie International Edition, Wiley-VCH Verlag, 2017, 56 (46), pp.14612-14617. ⟨10.1002/anie.201709156⟩. ⟨hal-01640114⟩

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