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Silicon-29 NMR studies of aqueous silicate solutions: Part II. Isotopic enrichment

✍ Scribed by Robin K. Harris; James Jones; Christopher T.G. Knight; David Pawson

Publisher: Elsevier Science
Year: 1980
Tongue: English
Weight: 806 KB
Volume: 69
Category: Article
ISSN: 0022-2860
DOI: 10.1016/0022-2860(80)85268-9

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## Abstract Silicon‐29 NMR spectra were obtained for more than 20 aqueous alkaline silicate solutions containing methanol. A signal assigned to CH~3~OSi(OH)~3~ or one of its deprotonated congeners was studied in detail for the first time for the solution conditions involved. Its appearance was moni

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The 29Si spin-lattice relaxation times, &(%), of the various silicate anions present in high-purity alkaline silicate solutions are reported. Regular silicate cages display the longest T,(29Si) values and, in the case of the cubic octamenc cage, an unexpectedly large nuclear Overhauser enhancement,

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## Abstract The ^17^O‐NMR. line widths of the enriched amino acids glycine, aspartic acid, glutamic acid and, for comparative reasons, acetic acid were measured in aqueous solution between pH 1 and 14. The ^17^O‐NMR. line‐width maxima of glycine at pH≈︁11 and acetic acid at pH≈︁5 are shown to arise