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So many tetrahedra: The condensation of [BO4] (orange) and [SO4] (yellow) tetrahedra in the first binary boron sulfate B2S2O9, leads to a structure with typical layered phyllosilicate topology. The compound is obtained from the hydrolysis of B(OH)3 and HSO3Cl.
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Logemann et al. (2013) studied this question.
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