Please use this identifier to cite or link to this item: doi:10.22028/D291-24507
Title: NMR and IR spectroscopic examination of the hydrolytic stability of organic ligands in metal alkoxide complexes and of oxygen bridged heterometal bonds
Author(s): Hoebbel, Dagobert
Reinert, Thomas
Schmidt, Helmut K.
Language: English
Year of Publication: 1996
OPUS Source: Better ceramics through chemistry VII : Organic/inorganic hybrid materials ; Symposium held April 8-12, 1996, San Francisco, California, USA / ed.: Bradley K. Coltrain … - Pittsburgh : Materials Research Society, 1996. — (Materials Research Society symposia proceedings ; 435), S. 461-467
SWD key words: Infrarotspektroskopie
Ligand <Biochemie>
DDC notations: 620 Engineering and machine engineering
Publikation type: Conference Paper
Abstract: IR and 13C NMR investigations of the hydrolytic stabilites of the saturated and unsaturated beta-keto ligands acetylacetone (ACAC), ethylacetoacetate (EAA), allylacetoacetate (AAA), methacryloxyethyl-acetoacetate (MEAA) of the Al-, Ti- and Zr-butoxide complexes show a strong dependence on the type of the metal alkoxide and the structure of the organic ligands. The hydrolytic stabilities of the ligands decrease in the order Al-Zr-Ti-alkoxide and ACAC>AAA>EAA>=MEAA. Sol-gel reactions of complexes having a weak ligand stability leads to a larger water consumption and to larger particle sizes in sols than those with stable ACAC ligands. Hetermetal bonds, i.e. Si-O-Al, Si-o-Ti and Si-O-Zr, in the system diphenylsiloxanediol/metal alkoxide (complex) proved by 29Si and 17O NMR are hydrolysed to a different extent depending on the water amount, the type of the Si-O-M bond and the structure of the heterometal species. The degradation of the heterometal bonds leads to a separation of M-O-M and Si-O-Si bonds which can entail a decreased homogeneity of the materials at a molecular level.
Link to this record: urn:nbn:de:bsz:291-scidok-28204
ISBN: 1-55899-338-X
Date of registration: 9-Apr-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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