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 |
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Keywords
- Catechol, hydrolysis
- Chemical modification
- Condensation
- Nuclear magnetic resonance
- Sol-gel process
- Titanium iso-propoxide
ASJC Scopus subject areas
- Ceramics and Composites
Cite this
Hydrolysis and condensation processes of titanium iso-propoxide modified with catechol : An NMR study. / Egawa, Kentaro; Suzaki, Kentaro; Sugahara, Yoshiyuki.
In: Journal of Sol-Gel Science and Technology, Vol. 30, No. 2, 05.2004, p. 83-88.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hydrolysis and condensation processes of titanium iso-propoxide modified with catechol
T2 - An NMR study
AU - Egawa, Kentaro
AU - Suzaki, Kentaro
AU - Sugahara, Yoshiyuki
PY - 2004/5
Y1 - 2004/5
N2 - 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.
AB - 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.
KW - Catechol, hydrolysis
KW - Chemical modification
KW - Condensation
KW - Nuclear magnetic resonance
KW - Sol-gel process
KW - Titanium iso-propoxide
UR - http://www.scopus.com/inward/record.url?scp=3142764918&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=3142764918&partnerID=8YFLogxK
U2 - 10.1023/B:JSST.0000034695.21475.76
DO - 10.1023/B:JSST.0000034695.21475.76
M3 - Article
VL - 30
SP - 83
EP - 88
JO - Journal of Sol-Gel Science and Technology
JF - Journal of Sol-Gel Science and Technology
SN - 0928-0707
IS - 2
ER -