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Synthesis and Structure of [(1R,2R)-C6H10(NH3)2][Ga(OH)(HPO4)2]·H2O, the First Metal Phosphate Containing a Chiral Amine

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journal contribution
posted on 07.08.1998, 00:00 by Hsiu-Mei Lin, Kwang-Hwa Lii
The first metal phosphate containing a chiral amine, [(1R,2R)-C6H10(NH3)2][Ga(OH)(HPO4)2]·H2O, has been synthesized hydrothermally and characterized by single-crystal X-ray diffraction. It crystallizes in the monoclinic space group P21 with a = 8.7202(2) Å, b = 7.1276(2) Å, c = 11.1411(4) Å, β = 96.129(1)°, and Z = 2. The structure consists of infinite chains of trans-corner-sharing GaO5(OH) octahedra with the adjacent octahedra being bridged by HPO4 groups, which are H-bonded with amine groups of the organic cations and the lattice water. The Ga−O bond lengths along the backbone of the chain are alternately short and long. For comparison, the gallophosphate-containing racemic mix is also synthesized. [trans-1,2-C6H10(NH3)2][Ga(OH)(HPO4)2]·H2O crystallizes in the centrosymmetric, orthorhombic space group Pbcm with a = 8.6993(2) Å, b = 21.8612(1) Å, c = 7.1557(2) Å, V = 1360.85(5) Å3, and Z = 4.