论文部分内容阅读
Two lanthanide coordination polymers, [Eu(HL)(L)(H_2O)2]n(1) and [Tb(H_(0.5)L)_2]_n(2), based on bifunctional 5-(1H-imidazol-1-yl) isophthalic acid(H_2L), are hydrothermally synthesized and characterized by both single-crystal and powder X-ray diffraction analyses, and FT-IR. In compound 1, the basic inorganic building unit of the coordination network is the dinuclear [Eu_2(COO)_6] cluster. Each [Eu_2(COO)_6] cluster connects four HL~- ligands and each HLligand links two [Eu_2(COO)_6] clusters, resulting in a 2D coordination layer. The adjacent 2 D layers are further connected via neighboring inter-layer hydrogen bonds to give a 3D supramolecular structure. In compound 2, the Tb~(3+) is coordinated to six oxygen atoms. Each Tb~(3+) ion connects six ligands and each ligand links three Tb~(3+) ions, leading to a 3D coordination polymeric network which exhibits remarkably high thermal stability up to 500 °C. Furthermore, due to the successful incorporation of Tb~(3+), compound 2 displays characteristic luminescent emission in the solid state at room temperature. The combination of high thermal stability and fluorescent property of compound 2 would make it as a promising light-emitting material.
Two lanthanide coordination polymers, [Eu (HL) (L) (H_2O) 2] n (1) and [Tb (H_ (0.5) L) _2] _n (2), based on bifunctional 5- (1H-imidazol- -yl) isophthalic acid (H_2L), are hydrothermally synthesized and characterized by both single-crystal and powder X-ray diffraction analyzes, and FT-IR. In compound 1, the basic inorganic building unit of the coordination network is the dinuclear [Eu_2 (COO) _6] cluster. Each [Eu_2 (COO) _6] cluster connects four HL ~ - ligands and each HLligand links two [Eu_2 (COO) _6] clusters, resulting in a 2D coordination layer. Each Tb ~ (3+) ion connects six ligands and each ligand links three Tb ~ (3+) ions, leading to a 3D coordination polymeric network which exhibits remarkably high thermal stability up to 500 ° C. In addition, due to the successful incorporation of Tb ~ (3+), compound 2 displays characteristic luminescent emission in the solid state at room temperature. The combination of high thermal stability and fluorescent property of compound 2 would make it as a promising light-emitting material.