The nine resonances in the hitherto unassigned %i magic-angle-spinning NMR spectrum of tricalcium silicate (C$) are tentatively assigned using a 6 versus dsro correlation between isotropic %i chemical shifts ( ) and mean Si-0 bond lengths (ds,,) observed for the a;-, B\_, and y-dicalcium silicate (C
High-resoluttin 29Si NMR in solid silicates: Correlations between shielding tensor and Si-O bond length
β Scribed by A.-R. Grimmer; R. Peter; E. Fechner; G. Molgedey
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 371 KB
- Volume
- 77
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Zetttralmstztut fhr attorgattrsche C/tetttte der Akadettrte der Wtssetrsciraftetz der DDR, I I99-Brrlur, DDR Reccwed 7-7 August 1980 "SI NhlR spectra of polycrystallmc Ca6 [SI~O,I(OH)~] and [(CH3)4N1 gS1g0x1 69H20 were measured usmg the cross polarlzatmn double-resonance technique Observed shleldmg tensors are related to the l.nown SI-0 bond systems The arrangement of the four St-0 bonds III the S104 tetrahedrn 1s rcfiected by the *'Sx shleldmp tensor TIC most shlcldcd ducctlon corresponds to the shortest Q-0 bond.
π SIMILAR VOLUMES
%I sluelding lensor data for sohd silrwres are compared =ilh structural data of the correspondmg SIO, tewahedra. demonstrating a hnear relallonship between mdlvldual SI-0 bond lengths and Ihe "bond dmxrlon related" shieldmg along the directions of the rour Si-0 bonds. This result is interpreted in r
Using known N3IR and structural data of solid silicates the linear correlation % = 1.187 X lo4 d(Si-0) -2014 between the isotropic z9Si NMR chemical shifts B (ppm) and the "isotropic" mean bond lengths d(Si-0) (nm) has been established. The results of semi-empirical calculations are in good agreemen