Synthesis and structure of the first protonated zincoborophosphate: (H ₃O)Zn(H₂O)₂BP₂O₈· H₂O

The solid acid of the first protonated zincoborophosphate, (H₃O) Zn (H₂O)₂BP₂O₈ · H ₂O (1), was soventothermally synthesized by the reaction of Zn (NO₃)₂ · 6H₂O and H₃BO ₃ with H₃PO₄ in a mixed solvent, and structurally characterized by single-crystal X-ray diffraction analysis. It crystallizes in the hexagonal P6₁22, a = 0.9604(4) nm, c = 1.5297(6) nm, V = 1.2218(8) nm³, D_c = 2.921 g/cm³, Z = 6, F (000) = 1080, μ = 3.495 mm^-1. The structure features that the tetrahedra-tetrahedra helices interconnected by octahedra and strong hydrogen bond interactions form a three-dimensional framework. The protonated water molecules are located at unique positions. Other characterizations by IR and thermal analysis are also described.