Synthesis, structural characterization, and solid-state NMR spectroscopy of [Ga(phen)(H1.5PO4)2]·H2O and [Ga(phen)(HPO4)(H2PO4)]·1.5H2O (phen=1, 10-phenanthroline), two organic–inorganic hybrid compounds with 1-D chain structures

Two new organic–inorganic hybrid compounds, [Ga(phen)(H1.5PO4)2]·H2O (1) and [Ga(phen)(HPO4)(H2PO4)]·1.5H2O (2) (phen=1,10-phenanthroline), have been synthesized by hydrothermal methods and structurally characterized by single-crystal X-ray diffraction, infrared spectroscopy, thermogravimetric analysis, and solid-state NMR spectroscopy. Their structures consist of 1-D chains of strictly alternating GaO4N2 octahedra and phosphate tetrahedra. The phen ligands in both compounds bind in a bidentate fashion to the gallium atoms and the 1-D structures extend into 3-D supramolecular arrays via π–π stacking interactions of phen ligands and hydrogen bonds. 2H MAS NMR spectroscopy was applied to study the deuterated sample of 1 which contains very short hydrogen bonds with an O⋯O distance of 2.406(2) Å. Crystal data for 1: monoclinic, space group C2/c (No. 15), a=11.077(1) Å, b=21.496(2) Å, c=7.9989(7) Å, β=127.211(2)°, and Z=4. The crystal symmetry is the same for 2 as for 1 except a=27.555(2) Å, b=6.3501(5) Å, c=21.327(2) Å, β=122.498(1)°, and Z=8.