Four new coordination polymers constructed from benzene tricarboxylic acid: synthesis, crystal structure, thermal and magnetic properties.
Four new coordination polymers constructed from benzene tricarboxylic acid: synthesis, crystal structure, thermal and magnetic properties.
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DOI：
10.1039/c0dt00600a
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发表时间：
2010-10
影响因子：
4
通讯作者：
M. Nadeem;M. Bhadbhade;J. Stride
中科院分区：
文献类型：
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作者：
M. Nadeem;M. Bhadbhade;J. Stride
使用1，3，5-苯三羧酸（H（3）btc）作为有机连接剂，使得我们能够实现两对具有分子式[M（2）（btc）（F）]（n）（M（ii）= Mn（1），Co（2））和[M（3）（btc）（Hbtc）（OH）（H（2）O）（11）]（n）（M（ii）= Fe（3），其中btc和Hbtc分别表示完全和双去质子化的三羧酸酯。采用水热法合成了这些化合物，并通过热分析和变温磁性测量对其进行了表征。X射线衍射分析表明，化合物1和2的晶体结构属于单斜晶系C2/c，而化合物3和4的晶体结构属于单斜晶系C2。化合物1和2的特征在于通过btc的羧酸酯基团连接在一起的氟桥连的1D金属链，而化合物3和4由与相邻链具有强氢键的1D锯齿形链组成。变温磁性测量显示化合物1、2和4的总体反铁磁行为，在300- 2K的温度范围内没有磁有序现象的迹象。由于3和4是同构的，我们假设磁性相似。
The use of 1,3,5-benzene tricarboxylic acid (H(3)btc) as an organic linker has allowed us to achieve the rational design of two pairs of isostructural coordination polymers having molecular formulae [M(2)(btc)(F)](n) (M(ii) = Mn (1), Co (2)) and [M(3)(btc)(Hbtc)(OH)(H(2)O)(11)](n) (M(ii) = Fe (3), Co (4)) where btc and Hbtc represent the fully and doubly de-protonated tricarboxylates respectively. These compounds were synthesized using hydrothermal methods and characterized by thermal analysis and variable temperature magnetic measurements. The X-ray analysis reveals that compounds 1 and 2 crystallize in the monoclinic space group C2/c while compounds 3 and 4 crystallize in the monoclinic space group C2. Compounds 1 and 2 feature fluoride bridged 1D metal chains linked together via carboxylate groups of btc, whilst compounds 3 and 4 consist of 1D zigzag chains having strong hydrogen bonds with neighbouring chains. Variable temperature magnetic measurements show an overall antiferromagnetic behaviour for compounds 1, 2 and 4, with no indication of magnetic ordering phenomena in the temperature range from 300-2 K. As 3 and 4 are isostructural, we assume that the magnetic properties are similar.