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 1472-7773

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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: 21 Apr 2020 20:58

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