Ga(2,2′-bipy)(HPO₄)(H₂PO₄): First Layered Inorganic-Organic Hybrid Gallium Phosphate with a Neutral Framework

A novel gallium phosphate, Ga(2,2′-bipy)(HPO₄)(H ₂PO₄) (denoted FJ-12; FJ = Fujian Institute of Research on the Structure of Matter), which is the first example of layered inorganic-organic hybrid gallium phosphate with neutral framework, has been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. This compound crystallizes in the monoclinic system, space group P2₁/c (No. 14), with a = 10.9443(9), b = 15.8253(13), and c = 8.4201(7) Å, β = 108.898(2)°, V = 1379.7(2) ų, and Z = 4. The structure consists of HPO₄ and H₂PO ₄ tetrahedra and unusual GaO₄N₂ octahedra which are linked through their vertexes forming an undulated sheetlike structure with 4.12-net. The adjacent layers are stably packed together and exhibit interesting 3-D supramolecular arrays π-π interactions of the 2,2′-bipy groups.