The First Bismuth Borosulfates Comprising Oxonium and a Tectosilicate-Analogous Anion.

ABSTRACT: The first bismuth borosulfate (H₃ O)Bi[B(SO₄ )₂ ]₄ is only the second featuring a three-dimensional anion, the first tectosilicate-analogous borosulfate synthesised solvothermally without a precursor (from Bi(NO₃ )₃ ?5?H₂ O and B(OH)₃ in oleum); moreover, it is the first comprising two differently charged cations and crystallises in a new structure type in space group I 4? (no.?82) (a=11.857(1), c=8.149(1)?Å, 1947?refl., 111?param., wR2=0.037), confirmed by a second harmonic generation (SHG) measurement. The B(SO₄ )₄ supertetrahedra are connected via all four sulfate tetrahedra resulting in a three-dimensional anion with both H₃ O⁺ and Bi³⁺ cations in channels. Additionally, the crystal structure of a further bismuth borosulfate, Bi₂ [B₂ (SO₄ )₆ ], is elucidated crystallising isotypically to the rare-earth borosulfates R₂ [B₂ (SO₄ )₆ ] in space group C2/c (No.?15) (a=13.568(2), b=11.490(2), c=11.106(2)?Å, 3127?refl., 155?param., wR2=0.035). Moreover, the optical and thermal properties of both compounds are discussed.

SUBMITTER: Hammer M 

PROVIDER: S-EPMC7839778 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature