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Catalytically Active SiO 2 Aerogels Comprising Chelate Complexes of Palladium.
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- المؤلفون: Sipyagina, Nataliya A.1 (AUTHOR) ; Vlasenko, Nikita E.1 (AUTHOR) ; Malkova, Alena N.1 (AUTHOR) ; Kopitsa, Gennady P.2,3 (AUTHOR) ; Gorshkova, Yulia E.4,5 (AUTHOR) ; Kottsov, Sergey Yu.6 (AUTHOR) ; Lermontov, Sergey A.1 (AUTHOR)
- المصدر:
Molecules. Apr2024, Vol. 29 Issue 8, p1868. 14p.
- الموضوع:
- معلومة اضافية
- نبذة مختصرة :
A series of silica-based aerogels comprising novel bifunctional chelating ligands was prepared. To produce target aerogels, two aminosilanes, namely (3-aminopropyl)trimethoxysilane (APTMS) and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AEAPTMS), were acylated by natural amino acids ((S)-(+)-2-phenylglycine or L-phenylalanine), followed by gelation and supercritical drying (SCD). Lithium tetrachloropalladate was used as the metal ion source to prepare strong complexes of Pd2+ with amino acids covalently bonded to a silica matrix. Aerogels bearing chelate complexes retain the Pd2+ oxidation state after supercritical drying in CO2, but the Pd ion is reduced to Pd metal after SCD in isopropanol. Depending on the structure of amino complexes, Pd-containing aerogels showed catalytic activity and selectivity in the hydrogenation reactions of C=C, C≡C and C=O bonds. [ABSTRACT FROM AUTHOR]
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