Abstract
AbstractHydronium (oxonium) cation H3O+ plays an important role in mineralogy and mineral structures. However, it is rather difficult to detect it using conventional methods of crystal structure analysis. In particular, hydronium‐bearing eudialyte‐group minerals (EGMs) are well known. In this paper, we provide data on a low‐temperature X‐ray structure analysis and vibrationl spectroscopy study of previously described “potassium‐oxonium eudialyte” from the Khibiny alkaline massif (Kola Peninsula, Russia) as well as new data on vibrational spectra and hydrogen bonding of a series of sodium‐deficient hydrated EGMs including new samples and minerals whose crystal structures were investigated earlier. Based on single‐crystal X‐ray structural analysis and Raman spectroscopy, it is shown that natural sodium‐deficient hydrated zirconosilicates related to eudialyte contain different hydrated proton complexes with extremely strong hydrogen bonds. The data obtained have been compared with recent high‐level quantum electronic and vibrational calculations. Some hydrated proton complexes in hydrated eudialyte‐related minerals have Zundel‐ and Eigen‐type configurations with the O˙˙˙O distances of ~2.40 and ~2.55 Å, respectively.
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