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

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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:	14 Jul 2022 14:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/32493
DOI:	10.1039/B100474N

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