Hydrothermal Synthesis and Crystal Structure of Two New Hydrated Alkaline Earth Metal Borates Sr<sub>3</sub>B<sub>6</sub>O<sub>11</sub>(OH)<sub>2</sub> and Ba<sub>3</sub>B<sub>6</sub>O<sub>11</sub>(OH)<sub>2</sub>
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Two new hydrated borates Sr3B6O11(OH)2 (1) and Ba3B6O11(OH)2 (2) were hydrothermally synthesized. Their structures were determined by single-crystal X-ray diffraction and further characterized by IR, powder XRD, and DSC/TGA. Compound 1 crystallizes in the triclinic space group P–1 with unit cell parameters of a = 6.6275(13) Å, b = 6.6706(13) Å, c = 11.393(2) Å, α = 91.06(3)°, β = 94.50(3)°, and γ = 93.12(3)°, while compound 2 crystallizes in the noncentrosymmetric monoclinic space group Pc with a = 6.958(14) Å, b = 7.024(14) Å, c = 11.346(2) Å, and β = 90.10(3)°. In spite of the differences in symmetry and packing of the borate chains, both structures consist of the same fundamental building block (FBB) of a [B6O11(OH)2]−6 unit and three unique alkaline earth metal atoms.
