Modification study of aluminum sec-butoxide by acrylic acid

Citation
K. Velez et al., Modification study of aluminum sec-butoxide by acrylic acid, J SOL-GEL S, 16(3), 1999, pp. 201-208
Citations number
15
Categorie Soggetti
Material Science & Engineering
Journal title
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
ISSN journal
09280707 → ACNP
Volume
16
Issue
3
Year of publication
1999
Pages
201 - 208
Database
ISI
SICI code
0928-0707(199911)16:3<201:MSOASB>2.0.ZU;2-R
Abstract
A new way of modifying aluminum sec-butoxide (Al(OBus)(3)) is proposed. Thi s synthesis is carried out by reacting Al(OBus)(3) dissolved in tetrahydrof uran with an unsaturated acid, viz. acrylic acid. The structure evolution of Al(OBus)(3) with increasing acrylic acid amounts is investigated by infrared, H-1 NMR, C-13 NMR, and Al-27 NMR spectroscopi es and viscosity measurements. Information obtained suggests that the excha nge reaction occurring between butoxy groups and acrylate ligands is stoppe d for an acid/alkoxide molar ratio within the range 1.6-1.7. This value lea ds us to assume that the dominant trimeric species of precursor is preserve d after modification. Moreover, Al-27 NMR analysis only reveals the presenc e of hexacoordinated Al sites in the structure of the modified Al(OBus)(3). Evidence of the acrylic acid reaction with sec-butanol released during the alkoxide modification is also proved by the infrared and C-13 NMR data. How ever the produced ester amount can be considered as negligible.