Synthesis and Characterization of the Chain Borosulfates (NH4)3[B(SO4)3] and Sr[B2(SO4)4] |
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| Authors: | Philip Netzsch Henning A. Höppe |
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| Affiliation: | Chair of Solid State and Materials Chemistry, Institute of Physics, University of Augsburg, Universitaetsstraße 1, 86159 Augsburg, Germany |
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| Abstract: | Two new borosulfates were obtained either by an open vessel synthesis from sulfuric acid and B(OH)3, yielding (NH4)3[B(SO4)3] or from solvothermal synthesis in oleum enriched sulfuric acid and B(OH)3, yielding Sr[B2(SO4)4]. (NH4)3[B(SO4)3] crystallizes homeotypic to K3[B(SO4)3] in space group Ibca (Z = 8, a = 728.58(3) pm, b = 1470.84(7) pm, c = 2270.52(11) pm), comprising open branched vierer single chains {1∞[B(SO4)2(SO4)2/2]3–}. Sr[B2(SO4)4] crystallizes as an ordered variant of Pb[B2(SO4)4] in space group Pnna (Z = 4, a = 1257.4(4) pm, b = 1242.1(4) pm, c = 731.9(2) pm), consisting of loop branched vierer single chains {1∞[B(SO4)4/2]2–}. Vibrational spectroscopy confirms both refined structure models. Thermal analysis of the dried powders, showed a decomposition towards the binary and ternary components, whereas a thermal treatment in the presence of the mother liquor promotes a decomposition of Sr[B2(SO4)4] towards Sr[B2O(SO4)3]. |
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| Keywords: | Borosulfates Structure elucidation Ammonium Strontium Thermal analysis |
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