29Si NMR chemical shifts in silicates

Prabakar, S. ; Rao, K. J. ; Rao, C. N. R. (1991) 29Si NMR chemical shifts in silicates Chemical Physics Letters, 183 (3-4). pp. 176-182. ISSN 0009-2614

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Related URL: http://dx.doi.org/10.1016/0009-2614(91)80046-Z


29Si chemical shifts in a wide variety of silicates in crystalline, glassy and gel states have been related to a parameter, P, which takes into account the electronegativity and the structural description of the silicate units as well as the ionic potential of the modifier cation. The relation, δ(ppm)=28.4 [1-exp(-P)]-110.5, besides having predictive value, satisfactorily accounts for all the available chemical-shifts data on silicates and shows the right kind of limiting behaviour, with d approaching the Q0 value at large P.

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