Identification of hydrogen species in alunite-type minerals by multi-nuclear solid-state NMR spectroscopy

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Marco E. Ciriotti
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Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Identification of hydrogen species in alunite-type minerals by multi-nuclear solid-state NMR spectroscopy

Messaggio da Marco E. Ciriotti » lun 08 apr, 2019 14:10

Referenza:
▪ Grube, E., Lipton, A.S., Gro Nielsen, U.G. (2019): Identification of hydrogen species in alunite-type minerals by multi-nuclear solid-state NMR spectroscopy. Physics and Chemistry of Minerals, 46, 299–309.

Abstract:
The various hydrogen species present in a series of synthetic hydroniumjarosite ((H3O)Fe3(SO4)2(OH)6), and ammonioalunite ((NH4)Al3(SO4)2(OH)6) as well synthetic potassium (Cr3+ and V3+) and hydronium (V3+, Cr3+, and Ga3+) analogues were identified and quantified by 1H and 2H MAS NMR spectroscopy. The results confirm the defect mechanism proposed for alunite Nielsen et al. (Am Miner 92: 587–597, 2007), and allow for identification and quantification of even a few percent structural defects. For the paramagnetic samples, the isotropic shift for G2-OH group (V3+, Cr3+, and Fe3+) span more than 1100 ppm, which is related to different d-electron configuration (d2, d3, and d5). Analysis of the 1H and 27Al MAS NMR spectra shows that the synthetic ammonioalunite contains small amounts (5–10%) of hydronium. Furthermore, the close structural relationship between of hydronium and gallium alunite is reflected by the 27Al and 71Ga quadrupole coupling parameters. Thus, the current work demonstrates the applicability of solid state NMR spectroscopy for identification and quantification of hydrogen species in both dia- and paramagnetic minerals.
Marco E. Ciriotti

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