Three-Dimensional Six-Connecting Organic Building Blocks Based on Polychlorotriphenylmethyl Units—Synthesis, Self-Assembly, and Magnetic Properties
作者:Nans Roques、Daniel Maspoch、Klaus Wurst、Daniel Ruiz-Molina、Concepció Rovira、Jaume Veciana
DOI:10.1002/chem.200600447
日期:2006.12.13
process to yield two-dimensional (2D) hydrogen-bonded structures ([1(Et(2)O)(3)] and [4(Et(2)O)(3)]). The presence of direct hydrogen bonds between the radicals in the latter phase of 1 gives rise to very weak ferromagnetic intermolecular interactions at low temperatures, whereas when the radicals are isolated by THF molecules these interactions are antiferromagnetic and very weak. The role played by the
报告了基于坚固,刚性和开壳聚氯三苯甲基(PTM)单元(自由基1)的三维六连接有机构建基的合成,并详细描述了其自组装性能。通过在结晶过程中用乙醚代替THF,可以降低这种高极性分子及其氢化前体化合物4与含氧溶剂([1THF(6)]和[4THF(6)])形成氢键的趋势,产生二维(2D)氢键结构([1(Et(2)O)(3)]和[4(Et(2)O)(3)])。在低温的1相中,自由基之间存在直接氢键,从而在低温下产生非常弱的铁磁分子间相互作用,而当自由基被THF分子隔离时,这些相互作用是反铁磁的并且非常弱。通过确定晶体结构和测量相应的六酯基6的磁性,已说明了羧基不仅在自组装性质中而且在磁相互作用的传递中所起的作用。分子单元的堆积导致弱的反铁磁分子间相互作用。试图通过从浓硝酸中重结晶化合物1和4来获得固态的分子溶剂化并增加结构和磁性尺寸的尝试,从而提供了两个三维(3D)坚固的氢键结构。尽管化合物4获得的