Catalytically Active SiO2 Aerogels Comprising Chelate Complexes of Palladium

Autor: Nataliya A. Sipyagina, Nikita E. Vlasenko, Alena N. Malkova, Gennady P. Kopitsa, Yulia E. Gorshkova, Sergey Yu. Kottsov, Sergey A. Lermontov
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Molecules, Vol 29, Iss 8, p 1868 (2024)
Druh dokumentu: article
ISSN: 1420-3049
29706963
DOI: 10.3390/molecules29081868
Popis: 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.
Databáze: Directory of Open Access Journals
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