...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Towards a better understanding of magnetic interactions within m-phenylene alpha-nitronyl nitroxide and imino nitroxide based radicals, part III: Magnetic exchange in a series of triradicals and tetraradicals based on the phenyl acetylene and bipheny
【24h】

Towards a better understanding of magnetic interactions within m-phenylene alpha-nitronyl nitroxide and imino nitroxide based radicals, part III: Magnetic exchange in a series of triradicals and tetraradicals based on the phenyl acetylene and bipheny

机译：为了更好地理解间亚苯基基于亚硝基硝基亚硝酸和亚氨基亚硝基的基团之间的磁性相互作用，第三部分：基于苯基乙炔和联苯的一系列三基和四基的磁性交换

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The present work completes and extends our previous reports [1,21 on the determination of the magnetic ground state and on the strength of the through bond exchange coupling within series of biradicals. This knowledge was subsequently exploited for the analysis of the magnetic interactions in their crystals. We report here the studies of series of triradicals incorporating alpha-nitronyl nitroxides (NN) or alpha-imino nitroxides (IN) as terminal radical fragments connected through a m-phenylene coupling unit in one case and a phenyl acetylene unit in other case. Tetraradical derivatives have also been studied. The studies of isolated molecules (EPR in solution and DFT calculations) allow the assessment of the magnetic interactions through the magnetic coupling unit. All triradical derivatives are found to exhibit a quartet ground state, whereas a singlet ground state is determined for the tetraradical. This last result reinforces previous findings that the singlet ground state is favoured in related biradicals involving similar m-phenylene couplers. Moreover, the through bond magnetic exchange coupling for the ortho-meta connectivity could be demonstrated as being ferromagnetic, thus ascertaining our previous hypotheses. The magnetic properties of the triradicals and tetraradicals in their solid state have been rationalized by using a previously proposed methodology, allowing to identify the most relevant magnetic pathways.
机译：本工作完成并扩展了我们先前的报告[1,21，有关确定磁性基态和有关一系列双基团之间的直键交换耦合的强度。这些知识随后被用于分析其晶体中的磁性相互作用。我们在这里报告了一系列三基团的研究，该三基团在一种情况下通过间亚苯基偶联单元与苯基乙炔单元连接，并以α-亚硝基硝基氮（NN）或α-亚氨基硝基（IN）作为末端自由基片段。还研究了四价基衍生物。对孤立分子的研究（溶液中的EPR和DFT计算）可以评估通过磁耦合单元进行的磁相互作用。发现所有三基衍生物都表现出四重基态，而四基自由基则确定为单重基态。最后的结果加强了先前的发现，即在涉及相似的间亚苯基偶联剂的相关双自由基中，单线态基态是有利的。此外，用于正交元连接的直键式磁交换耦合可以证明是铁磁性的，因此可以确定我们先前的假设。三自由基和四自由基在固态时的磁性已经通过使用先前提出的方法进行了合理化，从而可以确定最相关的磁路。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号