Organic–inorganic hybrid materials constructed from inorganic lanthanide sulfate skeletons and organic 4,5-imidazoledicarboxylic acid
作者:Yan-Qiong Sun、Guo-Yu Yang
DOI:10.1039/b706072f
日期:——
Five different types of the lanthanide sulfateâcarboxylates family, [La2(SO4)(Himdc)2(H2O)2] 1, [Gd2(SO4)2(Himdc)(H2O)3]·H2O 2, [Ln2(SO4)2(Himdc)(H2O)3]·H2O (Ln = Gd 3a, Eu 3b), [Eu6Cu(SO4)6(Himdc)4(H2O)14] 4, and [Ln(Himc)(SO4)(H2O)] (Ln = Eu 5a, Gd 5b, Tb 5c, Dy 5d, Er 5e); H2imc = 4-imidazolecarboxylic acid, H3imdc = 4,5-imidazoledicarboxylic acid) have been obtained by hydrothermal reactions of Ln2O3, transition metal sulfates and H3imdc at 170 °C and characterized by means of elemental analyses, IR, TG analysis, luminescence spectroscopy and single crystal X-ray diffraction. The 3D structure of 1 is constructed from alternately linkages of organic La(Himdc)} layers and inorganic La2O2(SO4)} layers, with the La atoms as hinges. 2 and 3a/3b both contain alternately arranged 1D left- and right-handed helical Ln(imdc)} chains bridged by SO42â anions to form a 3D framework with 1D rectangle-like channels along the b axis. The structural differences of 2 and 3a/3b lie in the linkages of the SO42â anions. Complex 4 consists of 2D tubular Euâsulfate layers pillared by Cu(Himdc)2} units to generate a 3D network. Complexes 5aâ5e possess 2D bamboo-raft-like layer structures based on helical tubes. Interestingly, H2imc comes from the in-situ decarboxylation of H3imdc in the hydrothermal reactions. The luminescence properties of the complexes 3a, 4, 5a5c, 5d were investigated in solid state at room temperature.
五种不同类型的镧系元素硫酸盐-羧酸盐家族,[La2(SO4)(Himdc)2(H2O)2] 1、[Gd2(SO4)2(Himdc)(H2O)3]·H2O 2、[Ln2( SO4)2(Himdc)(H2O)3]·H2O (Ln = Gd 3a, Eu 3b), [Eu6Cu(SO4)6(Himdc)4(H2O)14] 4, 和 [Ln(Himc)(SO4) (H2O)](Ln=Eu 5a、Gd 5b、Tb 5c、Dy 5d、Er 5e); H2imc = 4-咪唑甲酸,H3imdc = 4,5-咪唑二甲酸)是由Ln2O3、过渡金属硫酸盐和H3imdc在170℃下进行水热反应得到的,并通过元素分析、红外、热重分析、发光光谱进行了表征和单晶X射线衍射。 1的3D结构是由有机La(Himdc)}层和无机La2O2(SO4)}层交替连接而成,以La原子作为铰链。 2和3a/3b都包含交替排列的一维左手和右手螺旋Ln(imdc)}链,由SO42-阴离子桥接,形成沿b轴具有一维矩形通道的3D框架。 2和3a/3b的结构差异在于SO42-阴离子的连接。复合体 4 由 2D 管状 Eu-硫酸盐层组成,由 Cu(Himdc)2} 单元支撑,形成 3D 网络。配合物5a-5e具有基于螺旋管的二维竹筏状层结构。有趣的是,H2imc 来自 H3imdc 在水热反应中的原位脱羧。研究了配合物3a、4、5a5c、5d在室温下的固态发光性质。