Synthesis, crystal structure and 71Ga MAS NMR spectroscopy of a novel gallium phosphatooxalate: [Ga5(OH)2(C10H9N2)(C2O4)(PO4)4]·2H2O

The synthesis and characterization of a novel three-dimensional gallium phosphatooxalate is described; the structure consists of GaO4 tetrahedra and GaO6 octahedra linked by phosphate and oxalate groups to form two-dimensional sheets between which are GaO4N square pyramids, generating tunnels in which the monoprotonated 4,4′-bipyridine molecules reside; 71Ga MAS NMR confirms the presence of four-, five- and six-coordinate Ga atoms.