BONDING STATES OF SURFACE VANADIUM(V) OXIDE PHASES ON SILICA - STRUCTURAL CHARACTERIZATION BY V-51 NMR AND RAMAN-SPECTROSCOPY

Authors
DAS N ECKERT H HU HC WACHS IE WALZER JF FEHER FJ
Citation
N. Das et al., BONDING STATES OF SURFACE VANADIUM(V) OXIDE PHASES ON SILICA - STRUCTURAL CHARACTERIZATION BY V-51 NMR AND RAMAN-SPECTROSCOPY, Journal of physical chemistry, 97(31), 1993, pp. 8240-8243
Citations number
27
Categorie Soggetti
Chemistry Physical
Journal title
Journal of physical chemistry → ACNP
ISSN journal
00223654
Volume
97
Issue
31
Year of publication
1993
Pages
8240 - 8243
Database
ISI
SICI code
0022-3654(1993)97:31<8240:BSOSVO>2.0.ZU;2-Z
Abstract
The coordination and local order of vanadium(V) surface oxides on sili ca are examined by V-51 spin echo and MAS NMR, as well as by Raman spe ctroscopy. Comparison with corresponding data on two crystallographica lly characterized model compounds, [Ph3SiO]3VO and [(c-C6H11)7(Si7O12) VO]2, reveals unambiguously that the vanadia species found at the sili ca surface is a three-legged (SiO)3V=O unit. These results support the hypothesis that silsesquioxanes are appropriate model systems for hyd roxylated silica surfaces.