Shi Yang, Song Miao-Miao, Tao Dong-Liang, Bo Qi-Bing
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
College of Chemistry and Material Engineering, Fuyang Normal University, Fuyang 236037, PR China.
ACS Omega. 2018 Sep 27;3(9):12122-12131. doi: 10.1021/acsomega.8b01963. eCollection 2018 Sep 30.
In an attempt to investigate the influence of many variables on the synthesis of lanthanide coordination polymers (Ln-CPs) assembled from the ligand 3,3-dimethylcyclopropane-1,2-dicarboxylic acid, three different Ln-CPs with formulae [La(μ-dcd)(μ-O)(H)] (), [Gd(μ-dcd)(HO)] (), and [Gd(μ-OH)(μ-dcd)(μ-ac)(HO)] () (dcd = 3,3-dimethylcyclopropane-1,2-dicarboxylate, ac = acetate) have been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectrum, thermal analysis, powder X-ray diffraction, and single X-ray diffraction techniques. represents the first report of the three-dimensional (3D) Ln-CPs based on nonanuclear lanthanide clusters, although it shows extremely low gas uptakes. exhibits one of the previously reported 3D lanthanide wheel cluster-like frameworks. characterizes a novel one-dimensional ladder-like chain [Gd(OH)] decorated with mixed ligand ribbons. Variable-temperature magnetic susceptibility measurement reveals that the shortest Gd···Gd distance in induces the antiferromagnetic interactions between adjacent Gd cations within the hydroxyl-bridged binuclear unit. Remarkably, magnetic investigation for indicates a unique metamagnetic transition from the antiferromagnet to ferromagnet. Furthermore, magnetic studies for also exhibit the presence of significant magnetocaloric effect with a large magnetic entropy change.
为了研究多种变量对由配体3,3 - 二甲基环丙烷 - 1,2 - 二羧酸组装而成的镧系配位聚合物（Ln - CPs）合成的影响，通过水热法合成了三种不同的Ln - CPs，其化学式分别为[La(μ - dcd)(μ - O)(H)] （）、[Gd(μ - dcd)(H₂O)] （）和[Gd(μ - OH)(μ - dcd)(μ - ac)(H₂O)] （）（dcd = 3,3 - 二甲基环丙烷 - 1,2 - 二羧酸根，ac = 乙酸根），并通过元素分析、红外光谱、热分析、粉末X射线衍射和单晶X射线衍射技术对其结构进行了表征。 代表了基于九核镧系簇的三维（3D）Ln - CPs的首次报道，尽管其气体吸附量极低。 展示了一种先前报道的3D镧系轮簇状框架。 表征了一种由混合配体带装饰的新型一维梯状链[Gd(OH)] 。变温磁化率测量表明， 中最短的Gd···Gd距离诱导了羟基桥连双核单元内相邻Gd阳离子之间的反铁磁相互作用。值得注意的是，对 的磁性研究表明存在从反铁磁体到铁磁体的独特变磁转变。此外，对 的磁性研究还显示出具有大磁熵变的显著磁热效应。
