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

Published inAngewandte Chemie: International Edition, vol. 56, no. 46, p. 14612-14617
Publication date2017
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 triplehelical 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 molecularbased energy-transfer upconversion (ETU) at room temperature.

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Citation (ISO format)
ZARE, Davood et al. Controlling Lanthanide Exchange in Triple-Stranded Helicates: A Way to Optimize Molecular Light-Upconversion. In: Angewandte Chemie: International Edition, 2017, vol. 56, n° 46, p. 14612–14617. doi: 10.1002/anie.201709156
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ISSN of the journal1433-7851
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Creation11/15/2017 10:34:00 AM
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