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ToolsClayden, N. J., Esposito, S. and Aronne, A. (2001) Chemical heterogeneity in phosphosilicate gels by NMR magnetisation exchange. Journal of the Chemical Society. Dalton Transactions (13). pp. 2003-2008. ISSN 1477-9226
Full text not available from this repository. (Request a copy)Abstract
Nanometre scale chemical heterogeneity has been revealed in a phosphosilicate gel by P-31 spin exchange. Monomeric phosphorus was found near to phosphorus singly cross-linked with phosphorus. Phosphorus doubly cross-linked with phosphorus was found to be remote from both other types of phosphorus species. Radiofrequency driven magnetisation exchange through P-31-P-31 dipolar coupling was rather ineffective, even with recoupling times of up to 30 ms, demonstrating the weak P-31-P-31 dipolar coupling and the effect of residual H-1-P-31 dipolar coupling. Effective P-31 spin exchange was possible in the laboratory frame through the H-1 spin interactions, when mixing times from 100 ms to 2 s were used.
| Item Type: | Article |
|---|---|
| Faculty \ School: | Faculty of Science > School of Chemistry |
| Depositing User: | Rachel Smith |
| Date Deposited: | 15 Jun 2011 11:21 |
| Last Modified: | 24 Oct 2022 03:35 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/32493 |
| DOI: | 10.1039/B100474N |
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