17 O NMR and Computational Study of a Tetrasiliconiobate Ion, [H 2+ x Si 4 Nb 16 O 56 ] (14− x )

Rates of oxygen‐isotope exchange were measured in the tetrasiliconiobate ion [H 2+ x Si 4 Nb 16 O 56 ] (14− x )− to better understand how large oxide ions interact with water. The molecule has 19 nonequivalent oxygen sites and is sufficiently complex to evaluate hypotheses derived from our previous...

Full description

Saved in:
Bibliographic Details
Published in:Chemistry : a European journal 2011-08, Vol.17 (34), p.9359-9367
Main Authors: Johnson, Rene L., Villa, Eric M., Ohlin, C. A., Rustad, James R., Casey, William H.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Rates of oxygen‐isotope exchange were measured in the tetrasiliconiobate ion [H 2+ x Si 4 Nb 16 O 56 ] (14− x )− to better understand how large oxide ions interact with water. The molecule has 19 nonequivalent oxygen sites and is sufficiently complex to evaluate hypotheses derived from our previous work on smaller clusters. We want to examine the extent to which individual oxygen atoms react independently with particular attention given to the order of protonation of the various oxygen sites as the pH decreases from 13 to 6. As in our previous work, we find that the set of oxygen sites reacts at rates that vary over approximately 10 4 across the molecule at 6
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201100004