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Crystals 2019, 9(3), 153; https://doi.org/10.3390/cryst9030153

Luminescent Layered Double Hydroxides Intercalated with an Anionic Photosensitizer via the Memory Effect

1
Instituto de Física da Universidade de São Paulo, São Paulo 05508-090, Brazil
2
Center for Surface Chemistry and Catalysis (COK-KAT), KU Leuven, B-3001 Leuven, Belgium
*
Author to whom correspondence should be addressed.
Received: 12 February 2019 / Revised: 8 March 2019 / Accepted: 9 March 2019 / Published: 14 March 2019
(This article belongs to the Special Issue Layered Double Hydroxides)
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Abstract

Layered double hydroxides (LDHs) containing Eu3+ activators were synthesized by coprecipitation of Zn2+, Al3+, and Eu3+ in alkaline NO3-rich aqueous solution. Upon calcination, these materials transform into a crystalline ZnO solid solution containing Al and Eu. For suitably low calcination temperatures, this phase can be restored to LDH by rehydration in water, a feature known as the memory effect. During rehydration of an LDH, new anionic species can be intercalated and functionalized, obtaining desired physicochemical properties. This work explores the memory effect as a route to produce luminescent LDHs intercalated with 1,3,5-benzenetricarboxylic acid (BTC), a known anionic photosensitizer for Eu3+. Time-dependent hydration of calcined LDHs in a BTC-rich aqueous solution resulted in the recovery of the lamellar phase and in the intercalation with BTC. The interaction of this photosensitizer with Eu3+ in the recovered hydroxide layers gave rise to efficient energy transfer from the BTC antennae to the Eu3+ ions, providing a useful tool to monitor the rehydration process of the calcined LDHs. View Full-Text
Keywords: layered double hydroxide; memory effect; rare earth; europium; 1,3,5-benzenetricarboxylic acid layered double hydroxide; memory effect; rare earth; europium; 1,3,5-benzenetricarboxylic acid
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Teixeira, A.C.; Morais, A.F.; Silva, I.G.; Breynaert, E.; Mustafa, D. Luminescent Layered Double Hydroxides Intercalated with an Anionic Photosensitizer via the Memory Effect. Crystals 2019, 9, 153.

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