Syntheses, structures and photoluminescent properties of lanthanide coordination polymers based on pyridyl functionalized imidazole dicarboxylic acid
作者:Song-Juan Liu、Yuanbiao Huang、Zu-Jin Lin、Xin-Fa Li、Rong Cao
DOI:10.1039/c3ra41166d
日期:——
A series of lanthanide coordination polymers formulated as [Ln2(HPIDC)2(H2O)8]·2(H2PIDC)·18H2O}n [Ln = Sm (1), Eu (2)], [Dy2(HPIDC)2(H2O)9]·2(H2PIDC)·17H2O}n (3), [Dy3(HPIDC)4(H2O)8]·(NO3)·6H2O}n (4), [Dy2(HPIDC)2(bdc)(H2O)4]·8H2O}n (5), [Ln(HPIDC)(bdc)]·H3O+·H2O}n [Ln = Er (6), Tm (7), Yb (8)] (H3PIDC = 2-(pyridin-4-yl)-1H-imidazole-4,5-dicarboxylic acid, H2bdc = 1,4-benzenedicarboxylic acid) based on pyridyl functionalized imidazole dicarboxylic acid ligand have been synthesized by hydrothermal methods and characterized by single crystal X-ray diffraction, powder X-ray diffraction, elemental analysis and thermogravimetric analysis. Compounds 1–3 are one-dimensional (1D) cationic chains linked by the H3PIDC ligands, and the free H2PIDC− act as counter ions in the crystal lattice. Compound 4 displays a 2D layer built up from 3-connected HPIDC2− ligands and 4-connected Dy(III) ions. While compounds 5–8 possess 2D network constructed from HPIDC2− and bdc2− ligands. The solid-state photoluminescent measurements show the photoluminescence of 1–5 are typical narrow emission bands of their lanthanide cations.
[Dy3(HPIDC)4(H2O)8]-(NO3)-6H2O}n (4),[Dy2(HPIDC)2(bdc)(H2O)4]-8H2O}n (5),[Ln(HPIDC)(bdc)]-H3O+-H2O}n [Ln = Er (6),Tm (7),Yb (8)](H3PIDC = 2-(吡啶-4-基)-1H-咪唑-4、5-二羧酸,H2bdc = 1,4-苯二甲酸),并通过单晶 X 射线衍射、粉末 X 射线衍射、元素分析和热重分析对其进行了表征。化合物 1-3 是由 H3PIDC 配体连接的一维阳离子链,游离的 H2PIDC- 在晶格中充当反离子。化合物 4 显示了由 3 个连接的 HPIDC2- 配体和 4 个连接的 Dy(III) 离子构成的二维层。化合物 5-8 具有由 HPIDC2- 和 bdc2- 配体构建的二维网络。固态光致发光测量结果表明,1-5 的光致发光是其镧系阳离子的典型窄发射带。