Comparative study of the surface hydroxyl groups of fumed and precipitated silicas. 2. Characterization by infrared spectroscopy of the interactions with water

Langmuir ◽  
1990 ◽  
Vol 6 (8) ◽  
pp. 1364-1372 ◽  
Author(s):  
A. Burneau ◽  
O. Barres ◽  
J. P. Gallas ◽  
J. C. Lavalley
Keyword(s):  
Infrared Spectroscopy ◽  
Comparative Study ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups

Adsorption of water and 18O exchange of surface hydroxyl groups on silica

1970 ◽  
Vol 48 (15) ◽  
pp. 2454-2456 ◽  
Author(s):  
B. A. Morrow ◽  
A. Devi
Keyword(s):  
Infrared Spectroscopy ◽  
Infrared Spectra ◽  
Sample Temperature ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Silanol Groups ◽  
Surface Hydroxyl Groups ◽  
Adsorption Of Water ◽  
Exchange Technique

Infrared spectroscopy has been used to show that the surface hydroxyl groups on highly dehydrated silica will exchange with 18O-labeled water. The degree of exchange depends on the sample temperature and is a maximum at about 400 °C, where approximately 65% of the silanol groups contain 18O. The use of the 18O exchange technique for assigning surface-adsorbate stretching modes is illustrated by considering the infrared spectra of BF3 chemisorbed on silica.

Comparative study of the surface hydroxyl groups of fumed and precipitated silicas. I. Grafting and chemical characterization

Langmuir ◽  
1989 ◽  
Vol 5 (2) ◽  
pp. 447-451 ◽  
Author(s):  
M. Zaborski ◽  
A. Vidal ◽  
G. Ligner ◽  
H. Balard ◽  
E. Papirer ◽  
...  
Keyword(s):  
Comparative Study ◽  
Chemical Characterization ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups

Comparative study of the surface hydroxyl groups of fumed and precipitated silicas. 3. DRIFT characterization of grafted n-hexadecyl chains

Langmuir ◽  
1990 ◽  
Vol 6 (8) ◽  
pp. 1389-1395 ◽  
Author(s):  
A. Burneau ◽  
O. Barres ◽  
A. Vidal ◽  
H. Balard ◽  
G. Ligner ◽  
...  
Keyword(s):  
Comparative Study ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups

The synthesis and structure of silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complexes

1986 ◽  
Vol 51 (7) ◽  
pp. 1430-1438 ◽  
Author(s):  
Alena Reissová ◽  
Zdeněk Bastl ◽  
Martin Čapka
Keyword(s):  
Free Surface ◽  
Hydroxyl Groups ◽  
Titanium Complex ◽  
Surface Hydroxyl ◽  
Surface Hydroxyl Groups ◽  
Free Hydroxyl ◽  
Cyclopentadienyl Anion

The title complexes have been obtained by functionalization of silica with cyclopentadienylsilanes of the type Rx(CH3)3 - xSi(CH2)nC5H5 (x = 1-3, n = 0, 1, 3), trimethylsilylation of free surface hydroxyl groups, transformation of the bonded cyclopentadienyl group to the cyclopentadienyl anion, followed by coordination of (h5-cyclopentadienyl)trichlorotitanium. The effects of single steps of the above immobilization on texture of the support, the number of free hydroxyl groups, the coverage of the surface by cyclopentadienyl groups and the degree of their utilization in anchoring the titanium complex have been investigated. ESCA study has shown that the above anchoring leads to formation of the silica-supported bis(h5-cyclopentadienyl)dichlorotitanium(IV) complex.

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