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Cd[B2(SO4)4] and H2[B2(SO4)4] - a phyllosilicate-analogous borosulfate and its homeotypic heteropolyacid
Matthias Hämmer1, Leonard C Pasqualini2, Sean S Sebastian3
1Institute of Physics, University Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany.
Abstract:
Borosulfates consist of heteropolyanionic networks of corner-shared (SO4)- and (BO4)-tetrahedra charge compensated by metal or non-metal cations. The anionic substructures differ significantly, depending on the different branching of the silicate-analogous borosulfate building blocks. However, only one acid has been characterized by single crystal X-ray diffraction so far. Herein, we present H2[B2(SO4)4] as the first phyllosilicate analogue representative, together with the homeotypic representative Cd[B2(SO4)4]. The latter can be considered the cadmium salt of the former. Their crystal structures and crystallographic relationship are elucidated. For H2[B2(SO4)4], the bonding situation is examined using Hirshfeld-surface analysis. Further, the optical and thermal properties of Cd[B2(SO4)4] are investigated by FTIR and UV-Vis spectroscopy, thermogravimetry, as well as temperature-programmed powder X-ray diffraction.
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