A novel one-dimensional inorganic-organic hybrid gallophosphate compound, Ga(2,2′-bipy)(HPO4)· (H2PO4)(denoted JGP-2) was synthesized hydrothermally with 2,2′-bipyridine as a ligand and characterized by X-ray powder diffraction (XRD), elemental analysis, inductively coupled plasma(ICP), TGA analysis, solid-state 31P NMR, and luminescence spectra and structurally determined by single-crystal X-ray diffraction analysis. JGP-2 crystallized in the triclinic system, space group Pī(No.2), with a=0.7818(1) nm, b=0.8611(2) nm, c=1.0908(2) nm, V=0.6727(2) nm3 and Z=2 with R1=0.0223. The structure of JGP-2 was built up by alternate arrangement of GaO4N2 octahedra, and HPO4(or H2PO4) tetrahedra to form an infinite one-dimensional corner-sharing-corner(CSC) chain. Through P sites, the CSC chains link with an unusual edge-sharing dimmer, Ga2F4(H2O)2, giving rise to a 4,10-membered ring net layered structure of JGP-7. On excitation at 254 nm, JGP-2 can emit strong blue light at λmax=388 nm. JGP-7 presents a strong fluorescence emission band centered at 394 nm(λex=340 nm), the emission energy of JGP-7 is red-shifted compared with that of JGP-2.
YANG Yu-linFAN Rui-qingJIANG Zhao-huaWANG Fu-pingLIU Yun-lingPANG Wen-qin
Three new gallium complexes formulated as [Ga(PDA)2][Ga(H2O)(PDA)(phen)]·4H2O(1),[Ga(PDA) 2 ]·(H2IN)·2H2O(2) and [Ga(OH)(PDA)(H2O)] 2(3)(H2PDA=pyridine-2,6-dicarboxylic acid;phen=1,10-phenanthroline;HIN=isonicotinic acid) have been synthesized under hydrothermal conditions.In the mixed-ligand system of complex 1,PDA2 and phen are connected to the central Ga 3+ cation as tri-and bi-dentate ligands,respectively.In complex 2,each Ga 3+ cation is six-coordinated by two PDA2 anions octahedrally.Complex 3 shows a binuclear structure,with the bond distance of Ga1― Ga2 being 0.30061(3) nm.The 3D supramolecular structures of the three complexes are constructed via hydrogen bonds and aromatic π-π packing interactions.All the three complexes exhibit intense blue emission at room temperature in the solid state,which are attributed to π*-π transition centered on the ligands.
