Chemical heterogeneity in phosphosilicate gels by NMR magnetisation exchange
Clayden, 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 |
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Faculty \ School: | Faculty of Science > School of Chemistry |
Depositing User: | Rachel Smith |
Date Deposited: | 15 Jun 2011 11:21 |
Last Modified: | 14 Jul 2022 14:30 |
URI: | https://ueaeprints.uea.ac.uk/id/eprint/32493 |
DOI: | 10.1039/B100474N |
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