| 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（Ⅱ）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 byπ-πstacking 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（Ⅱ）,Nd（Ⅲ）,Tb（Ⅲ）and Dy（Ⅲ）ions,respectively.Complexes 1,4 and 6 indicate the ferromagnetic interactions between the Co（Ⅱ）,Sm（Ⅲ）and Gd（Ⅲ）ions,respectively.Complex 8 exhibits a field-induced slow magnetic relaxation behavior. |
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