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Eight new coordination polymers containing rigid 4-(4-carboxy-phenyl)-pyridine-2-carboxylic acid: synthesis, structural diversity, fluorescence and magnetic properties
Inorganica Chimica Acta Pub Date : 2020-07-01 , DOI: 10.1016/j.ica.2020.119600
Xiao-Yu Zhang , Hui-Fang Wen , Qing-Feng Yang , Rui-Sha Zhou , Jiang-Feng Song

Abstract Eight new coordination polymers (CPs) were successfully synthesized through the solvo-thermal reactions of H2cppc ligand and a series of transition metal salts, [M(cppc)(H2O)2]n [M = Co, (1); Ni, (2); Zn, (3); Cd, (4)], [M(Hcppc)2]n [M = Cd, (5); Mn, (6); Cu, (7)], [Pb(cppc)(H2O)]n (8), [H2cppc = 4-(4-carboxy-phenyl)-pyridine-2-carboxylic acid]. These compounds were all characterized by elemental analysis, IR spectra, single-crystal X-ray diffraction, powder X-ray diffraction and thermal analysis. Compounds 1–4 have similar molecular formula except for different metal centers, notably, compounds 1–3 with isomorphic frameworks display two-dimensional layer structure, in which contain left- and right-handed chiral chains constructed from M2(H2O)2 dimers and cppc2− anions. However, compound 4 exhibits a three-dimensional network with Cd-O-Cd inorganic chains, different from that of compounds 1–3. Compounds 5–7 also have similar molecular formula except for different metal centers, the isomorphic compounds 5 and 6 exhibit two-dimensional undulating layers, while compound 7 displays one-dimensional chain. Compound 8 is a 2D layer structure with Pb2O2 secondary building units. In general, coordination geometries of metal centers and coordination modes of the ligands have an important effect on the structures of targeted compounds. Fluorescent experiments indicate that compounds 3–5 and 8 display apparently blue light emission in the solid state. Magnetic properties of compounds 1, 2, 6 and 7 are also investigated.

中文翻译:

八种含有刚性4-(4-羧基-苯基)-吡啶-2-羧酸的新型配位聚合物:合成,结构多样性,荧光和磁性

摘要通过H2cppc配体与一系列过渡金属盐[M(cppc)(H2O)2] n [M = Co,(1);的溶剂热反应成功合成了八种新型配位聚合物。镍(2); 锌(3); Cd,(4)],[M(Hcppc)2] n [M = Cd,(5);锰,(6);Cu,(7)],[Pb(cppc)(H 2 O)] n(8),[H 2 cppc = 4-(4-羧基-苯基)-吡啶-2-羧酸]。这些化合物都通过元素分析,红外光谱,单晶X射线衍射,粉末X射线衍射和热分析进行了表征。化合物1-4具有相似的分子式,但金属中心不同,值得注意的是,具有同构构架的化合物1-3显示二维层结构,其中包含由M2(H2O)2二聚体和cppc2-阴离子。然而,化合物4表现出具有Cd-O-Cd无机链的三维网络,与化合物1-3的网络不同。化合物5-7的分子式也不同,除了金属中心不同,同构化合物5和6具有二维起伏层,而化合物7具有一维链。化合物8是具有Pb2O2二级结构单元的2D层结构。通常,金属中心的配位几何形状和配体的配位方式对目标化合物的结构具有重要影响。荧光实验表明,化合物3-5和8在固态时显示出明显的蓝光发射。还研究了化合物1、2、6和7的磁性。化合物5-7的分子式也不同,除了金属中心不同,同构化合物5和6具有二维起伏层,而化合物7具有一维链。化合物8是具有Pb2O2二级结构单元的2D层结构。通常,金属中心的配位几何形状和配体的配位方式对目标化合物的结构具有重要影响。荧光实验表明,化合物3-5和8在固态时显示出明显的蓝光发射。还研究了化合物1、2、6和7的磁性。化合物5-7的分子式也不同,除了金属中心不同,同构化合物5和6具有二维起伏层,而化合物7具有一维链。化合物8是具有Pb2O2二级结构单元的2D层结构。通常,金属中心的配位几何形状和配体的配位方式对目标化合物的结构具有重要影响。荧光实验表明,化合物3-5和8在固态时显示出明显的蓝光发射。还研究了化合物1、2、6和7的磁性。通常,金属中心的配位几何形状和配体的配位方式对目标化合物的结构具有重要影响。荧光实验表明,化合物3-5和8在固态时显示出明显的蓝光发射。还研究了化合物1、2、6和7的磁性。通常,金属中心的配位几何形状和配体的配位方式对目标化合物的结构具有重要影响。荧光实验表明,化合物3-5和8在固态时显示出明显的蓝光发射。还研究了化合物1、2、6和7的磁性。
更新日期:2020-07-01
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