Summary.
We prepared organic gels and organic and carbon aerogels doped with europium through sol–gel processes. Eu-gels were prepared by sol–gel polymerization of the potassium salt of 2,4-dihydroxybenzoic acid with formaldehyde followed by ion-exchange with Eu(OTf)3. Eu–organic aerogels were obtained after CO2 supercritical drying of the gels and Eu–carbon aerogels were obtained by pyrolysing the organic aerogels. The Eu-gels containing 12% europium proved to be efficient as recoverable catalyst in Michael additions.
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Martínez, S., Martín, L., Molins, E. et al. Europium-Containing Organic Gels and Organic and Carbon Aerogels. Preparation and Initial Applications in Catalysis. Monatsh. Chem. 137, 627–633 (2006). https://doi.org/10.1007/s00706-006-0451-y
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DOI: https://doi.org/10.1007/s00706-006-0451-y