| Metal-organic complexes with d10electronic configuration transition metalcations have attracted enormous attention for their excellent fluorescent propertyand low cost. Therefore, they have potential applications in fluorescent materialfie ld. In this paper, Cd（NO3）2·4H2O, Zn（OAc）2·2H2O and CuI were selected asmetal resource. Aromatic carboxylic acid, such as2,4′-biphenyl-dicarboxylic acid（2,4′-H2bpdc）,3,3′,4,4′-biphenyltetracarboxylic acid （H4bptc） and benzimidazole-5,6-dicarboxylic acid （H3bidc） were choosen as basic ligands. Simultaneously,1,10-phenanthroline was introduced as secondary ligand in the synthesis process. Inthis way, six metal-organic complexes {[Cu（bpdc）（phen）]·2H2O}n1,{[Zn2（bpdc）2（phen）2]}n·H2O2,[Cu2（μ-I2）（phen）2]·CH3CN3,[Cu（μ-I）（phen）]·H2O4,[Cd（bic）（phen）]n5（H2bic=benzimidazole-6-carboxylic acid） and [Zn（H2O）6]（H2bptc）6with fluorescent property have been synthesized underhydro（solvo）thermal conditions. The structures of these complexes werecharacterized by elemental analysis, IR spectra, and single crystal X-ray diffraction.UV-Vis spectra, fluorescent emission spectra and fluorescence decay curves in thesolid-state as well as in DMSO solution, and fluorescent quantum yields are used tocharacterize their fluorescent property.Complexes1and2are based on2,4′-H2bpdc and phen. Complex1is space groupP21/c in monoclinic system, exhibiting1D double line structure. Complex2is spacegroup P-1in triclinic system, possessing1D undulated line structure. Thecoordination modes of bpdc2–ligand of complex1are different from that ofcomplex2. The result ind icates that metal ions will influence the structure of thecomplex to a certain degree. The fluorescent quantum yield of complex2is muchhigher than that of complex1, which is due to the fluorescence quenching caused bythe d→d transition in complex1.Complexes3and4are synthesized by the same metal resource and ligand, but indifferent solvents. Complex3contains one acetonitrile molecule in its asymmetricunit, exhibiting dinuclear structure. Complex4contains a water molecule in itsasymmetric unit, possessing mononuclear structure. The result indicates that solventmolecule will influence the structure of the complex. The fluorescent quantum yieldof complex3is much higher than that of complex4. That because the dihedralangles of the planes in complex3are smaller than that in complex4, which is goodfor the transition of the π electron.The decarboxylation of H3bidc was observed in the solvothermal synthetic processof complex5, so H2bic ligand （H2bic=benzimidazole-6-carboxylic acid） was formed. Complex5is space group Pbca in orthorhombic system. Cd（II） center issix-coordinated, forming a slightly distorted octahedron, possessing2D layerstructure. Complex5exhibits blue fluorescence in DMSO solution and in the solidstate, which has potential to be blue fluorescence material. Comlex6exhibits0Dstucture, possessing triclinic system and crystallizing in a space group P-1. Comlex6exhibits purple fluorescence in DMSO solution and green fluorescence in the solidstate. |
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