| In this paper,by selecting lanthanide,copper and cobalt ions as the centralmetals,3,5-bis?4-carboxyphenyl?pyridine?H2bcpp?,3-bromo-5-?4-carboxyphenyl?pyridine?HL?and 3,5-dichlorobenzoic acid?3,5-HDCB?as main ligands,2,2?-bipyridine?bipy?as the auxiliary ligand,eight complexes have been synthesized under hydrothermal and solvothermal conditions,namely,Co3?bcpp?2?HCOO?2?H2O?2?1?,CuL2?2?,Ln3?3,5-DCB?9?bipy??H2O?2·?bipy?[Ln=Nd?3?,Sm?4?],Ln2?3,5-DCB?6?bipy?H2O[Ln=Eu?5?,Gd?6?,Tb?7?,Dy?8?].These complexes were characterized by IR,elemental analysis,X-ray powder diffraction,X-ray single-crystal diffraction and thermogravimetric analysis.The photoluminescence and magnetism of the partial complexes were measured by fluorescence spectrometer and magnetometer.Complex 1 possesses a 3,6-connected three-dimensional topology structure constructed from linear trinuclear Co3?COO?6 cluster and bcpp anions.In complex 2,two adjacent Cu???ions are linked L to form a one-dimensional chain.Two adjacent one-dimensional chains are linked L to form a two-dimensional supramolecular layer.The oxygen atoms from the carboxylic acid group are used to extended 3,6-connected three-dimensional structure.Complexes 3 and 4 are isomorphic trinuclear structural units,with similar two-dimensional layered structures via the interaction of the hydrogen bonds.Complexes 5-8 are isomorphic dinuclear structural units,and the adjacent one-dimensional chains form supramolecular structure by?-?stacking interaction between 2,2?-bipyridine.Complexes 1 and 2 display the luminescent properties of organic ligands.Complexes 4,5,7 and 8 exhibit the characteristic luminescent properties of lanthanide ions.Complexes 2,3,7 and 8 show the antiferromagnetic interactions between the Cu???,Nd???,Tb???and Dy???ions,respectively.Complexes 1,4 and 6 indicate the ferromagnetic interactions between the Co???,Sm???and Gd???ions,respectively.Complex 8 exhibits a field-induced slow magnetic relaxation behavior. |
PDF Full Text Request