由三羧基配体桥联的含有线性四核钴簇单元的二维层状配位聚合物的组装和性质（英文）

Assembly and Properties of a 2D Layer Coordination Polymer Containing Linear Tetranuclear Cobalt-Cluster Unit Bridged by Tricarboxylic Acid Ligand

以金属钴盐、2-羟基-1,3,5-苯基三羧酸(OH-H_3BTC)为原料,在碱性条件下,通过水热方法合成了一个钴配位聚合物[Co_2(O-BTC)(H_2O)_5]_n(1),并利用X射线粉末和单晶衍射、红外光谱、元素分析以及热重等方法对该化合物进行了表征。化合物1含有线性四核单元[Co_4O_7],四核单元内的金属离子是通过羧酸氧原子和羟基氧原子桥联的。该四核单元进一步通过O-BTC^(4-)配体在ab平面上形成一个二维层状结构,相邻的层与层通过氢键作用形成一个三维超分子结构。热重分析结果显示化合物1在100℃开始失重。磁性研究表明,化合物1中相邻的钴离子之间存在反铁磁性相互作用。

The hydrothermal reaction of cobalt(Ⅱ)salts with 2-hydroxyl-1,3,5-benzenetricarboxylic acid(OH-H3BTC)in the presence of sodium hydroxide afforded a cobalt(Ⅱ)coordination polymer,namely[Co2(O-BTC)(H2O)5]n(1),which has been characterized by powder and single-crystal X-ray diffraction,infrared spectroscopy,elemental analysis,and thermogravimetric analysis.Compound 1 contains a linear tetranuclear unit[Co4O7]through the carboxylate oxygen and hydroxyl atoms,which are further linked to form a two-dimensional(2D)layered structure in the ab plane by the O-BTC4-organic ligands.Adjacent layers are packed along the c-axis with the hydrogen bond interactions dominating between the layers to form a three-dimensional(3D)supramolecular structure.Thermal analysis reveals that 1 begins to lose weight at ca.100℃.Magnetic studies reveal that dominant antiferromagnetic interactions are dominated between the magnetic centers in 1.CCDC:1841028.