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Immobilization of Small‐Molecule Ligands Containing Secondary or Tertiary Amine Groups onto TiO 2 ‐Supported Ru Catalysts Driven by the Hydrophobic Effect
Author(s) -
Chen Tianyou,
Xu Zushun
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800989
Subject(s) - catalysis , chemistry , amine gas treating , piperidine , aldehyde , selectivity , molecule , tertiary amine , combinatorial chemistry , organic chemistry , small molecule , polymer chemistry , biochemistry
A strategy for effectively immobilizing small‐molecule ligands onto TiO 2 ‐supported Ru catalysts is described. The immobilization was based on a simple two‐phase centrifugation technique and driven by the hydrophobic effect, likely leading to the formation of hydrophobic clusters of small‐molecule ligands. By using this strategy, a library of ligands containing secondary or tertiary amine groups and hydrophobic chains were successfully immobilized onto TiO 2 ‐supported Ru catalysts. Of these ligands, ligands containing 2,2,6,6‐tetramethyl‐1‐piperidine‐ N ‐oxyl (TEMPO) moieties significantly improved the selectivity for aldehyde at high conversion in aerobic oxidation of alcohols, resulting from the inhibition of auto‐oxidation of aldehydes. This strategy can generate diversity in preparation of organic/inorganic hybrid catalysts.