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Silicon‐Assisted Direct Covalent Grafting on Metal Oxide Surfaces: Synthesis and Characterization of Carboxylate N,N′‐Ligands on TiO 2
Author(s) -
Arzoumanian Henri,
Castellanos Nelson J.,
Martínez Fernando O.,
PáezMozo Edgar A.,
Ziarelli Fabio
Publication year - 2010
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200901092
Subject(s) - chemistry , isonicotinic acid , covalent bond , carboxylate , thermogravimetric analysis , oxide , polymer chemistry , molecule , inorganic chemistry , hexamethyldisiloxane , metal , organic chemistry , hydrazide , plasma , physics , quantum mechanics
The easy covalent bonding of an OH‐bearing molecule onto a metal oxide surface can be done by transesterifying a trimethylsilylated hydroxy function with the surface OH groups. This results in the grafting of the organic molecule directly on the matrix, accompanied by the formation of trimethylsilanol, which can easily be eliminated as volatile hexamethyldisiloxane and water. This was accomplished on a TiO 2 matrix with three carboxylic acids: acetic, isonicotinic, and 2,2′‐bipyridyl‐4,4′‐dicarboxylic acids. The N,N′‐immobilized ligand was then used for a dioxidomolybdenum entity and tested as such at room temperature and under atmospheric pressure O 2 oxidation of ethylbenzene. All intermediates and grafted species were fully characterized by 13 CMAS NMR spectroscopy, and thermogravimetric and elemental analysis.