| Autor: |
Sipyagina NA; Institute of Physiologically Active Compounds of Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 Severnij pr., Chernogolovka 142432, Russia., Vlasenko NE; Institute of Physiologically Active Compounds of Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 Severnij pr., Chernogolovka 142432, Russia., Malkova AN; Institute of Physiologically Active Compounds of Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 Severnij pr., Chernogolovka 142432, Russia., Kopitsa GP; Institute of Silicate Chemistry of Russian Academy of Sciences, 2 Adm. Makarova nab., St. Petersburg 199155, Russia.; Petersburg Nuclear Physics Institute Named by B.P.Konstantinov of NRC «Kurchatov Institute», 1 Orlova Roshcha, Gatchina 188300, Russia., Gorshkova YE; Joint Institute for Nuclear Research, 6 St. Joliot-Curie, Dubna 141980, Russia.; Institute of Physics, Kazan Federal University, Kazan 420008, Russia., Kottsov SY; Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky prosp., Moscow 119991, Russia., Lermontov SA; Institute of Physiologically Active Compounds of Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences, 1 Severnij pr., Chernogolovka 142432, Russia. |
| Abstrakt: |
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 Pd 2+ with amino acids covalently bonded to a silica matrix. Aerogels bearing chelate complexes retain the Pd 2+ oxidation state after supercritical drying in CO 2 , 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. |
