Abstract
The hydrolysis and condensation processes of titanium iso-propoxide modified with catechol (C6H4(OH)2; H 2cat) have been investigated by 1H, 13C and 17O nuclear magnetic resonance spectroscopy. The hydrolysis reactions of the modified titanium isoo-propoxide in the system with Ti:tetrahydrofuran (THF):H2O = 1:20:x (x =1,2 and 5 in a molar ratio) are essentially completed in the initial stage (<1 h), and the condensation reactions also proceed significantly during this stage. Upon hydrolysis with H2O/Ti = 1, the iso-propoxy groups are selectively hydrolyzed and the catecholate groups remain bound to titanium. With H2O/Ti = 2 and 5, both the iso-propoxy and catecholate groups are hydrolyzed, and the hydrolysis of the iso-propoxy groups is relatively preferential. Approximately half the catecholate groups are stably bound to titanium, even after hydrolysis with H2O/Ti = 5.
| Original language | English |
|---|---|
| Pages (from-to) | 83-88 |
| Number of pages | 6 |
| Journal | Journal of Sol-Gel Science and Technology |
| Volume | 30 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2004 May 1 |
Keywords
- Catechol, hydrolysis
- Chemical modification
- Condensation
- Nuclear magnetic resonance
- Sol-gel process
- Titanium iso-propoxide
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Chemistry(all)
- Biomaterials
- Condensed Matter Physics
- Materials Chemistry