萘氧乙酸构筑的铕(Ⅲ)和钐(Ⅲ)配合物的水热合成、晶体结构及荧光性质

Hydrothermal Syntheses,Crystal Structures and Luminescence Properties of Eu(Ⅲ) and Sm(Ⅲ) Complexes Assembled by 2-naphthoxyacetate Ligand

用水热方法合成了2个异质同晶镧系稀土配位聚合物,{[Ln2(2-naph)4(H2O)2](2-naph)2·2H2O}n(Eu,1;Sm,2)(2-naph=2-萘氧乙酸根),并通过X-射线衍射的方法测定了它们的结构。2个配合物均为沿着b轴方向扩展的一维链结构,是由一对2-萘氧乙酸配体连接二聚体单元[Ln2(2-naph)4(H2O)2]而形成的。在每个[Ln2(2-naph)4(H2O)2]二聚体单元中,2个螯合-桥连配位模式的2-萘氧乙酸配体和2个桥连配位模式的2-萘氧乙酸配体连接2个Ln(Ⅲ)原子形成了1个次级构筑单元(SBU)。每个Ln(Ⅲ)原子与1个水分子和6个2-萘氧乙酸配体进行连接,形成了1个八配位的变形的四方反棱柱的配位环境。另外,2个桥连配位的2-naph连接2个相邻的Ln(Ⅲ)原子形成了1个8-原子环。单链通过O-H…O氢键连接形成了二维层状超分子结构。此外,配合物1和2的热重分析以及室温下的固态荧光性质也在文中得到进一步研究和讨论。

Two isomorphous lanthanide coordination polymers, {[Ln2（2-naph）4（HEO）2]（2-naph）2.2H2O}n （1, Eu; 2, Sm） （where 2-naph=2-naphthoxyacetate）, have been hydrothermally synthesized, and their structures have been determined by X-ray single-crystal diffraction. Both complexes consist of a one-dimensional chain along b axis, which is derived from dimeric unit [Ln2（2-naph）4（H2O）2] linked by a pair of 2-naph ligands. In each dimeric unit [LnE（2-naph）4（H2O）2], two chelating-bridged 2-naph ligands and two bridged 2-naph ligands connect two Ln（Ⅲ） atoms, forming a secondary building unit （SBU）. Each Ln（Ⅲ） atom is in a distorted square anti-prism environment, coordinated by one aqua and six 2-naph ligands. In addition, two bridged 2-naph ligands connect two neighboring Ln（Ⅲ） atoms forming a eight-membered ring. The chains are linked by O-H…O hydrogen bonds to generate a twodimensional layer. The TGA and Luminescence properties in solid state of complex 1 and 2 have been further studied and discussed. CCDC： 690359, 1; 690360, 2.