Hydrothermal synthesis (in water-dimethylformamide) and crystal structure of MIL-30, a new layered fluorinated gallium phosphate with 1,3-diaminopropane and dimethylamine as templates

A new fluorinated gallium phosphate has been synthesized under mild solvothermal condition using a mixed water-dimethylformamide solvent. It has been characterized by single-crystal X-ray diffraction. Ga-3(PO4)(3)F-3. N2C3H12. NC2H7 (MIL-30), obtained at 180 degrees C (3 days), crystallizes in the orthorhombic space group P2(1)2(1)2(1) (no. 19), a=8.8107(2), b=10.2258(2), c=20.9082(3) Angstrom, V=1883.75(6) Angstrom(3). The structure is built up from layers of corner linked hexameric Ga-3(PO4)(3)F-3 units separated by protonated 1,3-diaminopropane and dimethylamine (coming from the decomposition of the co-solvent dimethylformamide). The hexamer consists of GaO4F2 octahedra, GaO4F trigonal bipyramids and PO4 tetrahedra which share corners. Within the layer, the connection mode of the hexameric building unit is similar to that found in the three-dimensional open-framework ULM-3.