Syntheses, structures, luminescence, and magnetic properties of one-dimensional lanthanide coordination polymers with a rigid 2,2'-bipyridine-3,3',6,6'-tetracarboxylic acid ligand.
Syntheses, structures, luminescence, and magnetic properties of one-dimensional lanthanide coordination polymers with a rigid 2,2'-bipyridine-3,3',6,6'-tetracarboxylic acid ligand.
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DOI：
10.1021/ic202063h
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发表时间：
2012-02
影响因子：
4.6
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合成了一系列一维镧系配位聚合物，通式为{[Ln（bptcH）（H（2）O）（2）]·H（2）O}（n）（Ln = Nd（III）（1），Eu（III）（2），Gd（III）（3），Tb（III）（4），Dy（III）（5），Ho（III）（6），或Er（III）（7））通过相应的镧系（III）苦味酸盐和2，2 ′-联吡啶-3，3 ′，6，6 ′-四羧酸（bptcH（4））的溶剂热反应合成。这些聚合物已通过单晶X-射线衍射，IR，PXRD，热重（TGA），和元素分析的结构表征。配位聚合物1-7是同构的;它们具有相同的3D超分子结构，并且在三斜空间群P1 <$1中结晶。由双核镧系元素构建的骨架呈现一维双链环状链结构，其中bptcH（3-）离子采用六齿配位模式。Eu（III）（2）和Tb（III）（4）聚合物在可见光区表现出特征的光致发光。通过测量聚合物2、3和5在1.8-300 K温度范围内的磁化率，研究了它们的磁性。
A series of novel one-dimensional (1-D) lanthanide coordination polymers (CPs), with the general formula {[Ln(bptcH)(H(2)O)(2)]·H(2)O}(n) (Ln = Nd(III) (1), Eu(III) (2), Gd(III) (3), Tb(III) (4), Dy(III) (5), Ho(III) (6), or Er(III) (7)) have been synthesized by the solvothermal reactions of the corresponding lanthanide(III) picrates and 2,2'-bipyridine-3,3',6,6'-tetracarboxylic acid (bptcH(4)). These polymers have been structurally characterized by single-crystal X-ray diffraction, IR, PXRD, thermogravimetric (TGA), and elemental analysis. Coordination polymers 1-7 are isostructural; they possess the same 3D supramolecular architectures and crystallize in triclinic space group P1̅. The frameworks constructed from dinuclear lanthanide building blocks exhibit one-dimensional double-stranded looplike chain architectures, in which the bptcH(3-) ions adopted hexadentate coordination modes. The Eu(III) (2) and Tb(III) (4) polymers exhibit characteristic photoluminescence in the visible region. The magnetic properties of polymers 2, 3, and 5 have been investigated through the measurement of their magnetic susceptibilities over the temperature range of 1.8-300 K.