AN NMR STUDY OF THE STRUCTURE OF HYDRATED FLUOROPHOSPHATOZIRCONATES (HAFNATES)
A. B. Slobodyuk1, N. A. Didenko1, M. M. Godneva2
1Institute of Chemistry, Far East Branch, Russian Academy of Sciences, Vladivostok, Russia
2Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center, Russian Academy of Sciences, Apatity, Russia
Keywords: фторофосфатоцирконаты, фторофосфатогафнаты, ЯМР, диффузионная подвижность, кристаллическое строение, fluorophosphatozirconates, fluorophosphatohafnates, NMR, diffusion mobility, crystal structure
Abstract
31P, 19F, 1H NMR is used to study fluorophosphatometalates of the composition MHfF2PO4×0.5H2O (M = Rb, Cs) and CsMe2F6PO4×4H2O (Me = Zr, Hf). The data obtained indicate the isostructurality of compounds in each of these two groups. The lines in the NMR spectra are assigned. Assumptions about the character of the bond of PO4 groups and F atoms with Me are made and schemes of the crystal structure of fluorophosphatometalates are proposed. The occurrence of several types of crystallization water characterized by different bond strengths and energy barriers of the diffusion motion is found.
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