Spectroscopy of condensed matter

Structure of pentafluoridozirconic acid hydrates from the vibrational spectroscopy data

E. I. Voit, N. A. Didenko

Institute of Chemistry, Far East Branch of the Russian Academy of Sciences, Vladivostok

Abstract: Crystalline hydrates of pentafluoridozirconic acid HZrF$_5$ $\cdot$ 3H$_2$O, HZrF$_5$ $\cdot$ 2H$_2$O and intermediate product of the thermal decomposition of acids ZrF$_4$ $\cdot$ H$_2$O were studied by vibrational spectroscopy and thermogravimetry. It is shown that the crystalline hydrates HZrF$_5$ $\cdot$ $n$H$_2$O ($n$ = 2, 3) are salts with complex H$_5$O$_2^+$ and H$_7$O$_3^+$ cations. Based on the results of quantum chemical calculations, the bands in the IR and Raman spectra were assigned.

Keywords: complex zirconium fluorides, pentafluoridozirconic acids, vibrational spectroscopy.

Received: 17.12.2021
Revised: 17.02.2022
Accepted: 25.06.2022

DOI: 10.21883/OS.2022.09.53295.3042-22

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