Synthesis, crystal structure, and luminescent properties of metal complexes bearing 2,6-pyridine-diacylhydrazide ligands: supramolecular assemblies via intermolecular interactions
作者:Su-Ni Qin、Zi-Lu Chen、Dong-Cheng Liu、Wan-Yun Huang、Fu-Pei Liang
DOI:10.1007/s11243-011-9479-x
日期:2011.5
Four metal complexes of N,N′-bis(salicyl)-2,6-pyridine-dicarbohydrazide ligand (H6L), [CoII(H4L)(H2O)2]·2DMF (1), [ZnII(H4L)(H2O)2]·2DMF (2), [CdII(H4L)(Py)2]·DMF·Py (3), and [CoIICo 2 III (H4L)4(H2O)4]·DMF·H2O (4), were synthesized and characterized by elemental analysis, IR, and single-crystal X-ray diffraction analysis. Structural studies revealed that complexes 1–3 present discrete mononuclear structures and complex 4 displays a centrosymmetric mixed-valence trinuclear structure. All four complexes are further extended into interesting two- or three-dimensional supramolecular frameworks. The luminescent properties of 2 and 3 were studied, which show emissions with maxima at 485 nm upon excitation at 396 nm for 2 and 476 nm upon excitation at 397 nm for 3, respectively.
合成了 N,N′-双(水杨基)-2,6-吡啶-二甲酸二酰肼配体 (H6L) 的四种金属配合物:[CoII(H4L)(H2O)2]-2DMF (1)、[ZnII(H4L)(H2O)2]-2DMF (2)、[CdII(H4L)(Py)2]-DMF-Py (3)、和[CoIICo 2 III (H4L)4(H2O)4]-DMF-H2O (4)的合成,并通过元素分析、红外和单晶 X 射线衍射分析对其进行了表征。结构研究表明,络合物 1-3 呈离散的单核结构,而络合物 4 则显示出中心对称的混价三核结构。这四个复合物都进一步扩展成有趣的二维或三维超分子框架。对 2 和 3 的发光特性进行了研究,结果表明,在 396 nm 处激发时,2 的最大发射波长为 485 nm ;在 397 nm 处激发时,3 的最大发射波长为 476 nm 。