• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Preparation and Characterisation of a New Inclusion Compound of Cucurbit[8]uril with a Nitroxide Radical
【24h】

Preparation and Characterisation of a New Inclusion Compound of Cucurbit[8]uril with a Nitroxide Radical

机译：新型含氮自由基的葫芦[8]尿素包合物的制备与表征

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

Cucurbit[n]urils (CBn, in which n=5–10)~[1–7] and cyclodextrins CDs)~[8–10] are two different kinds of host molecules that have attracted great attention in recent years for their special structures and for applications involving interactions with guest molecules. In particular, the specific inclusion of radical cations into the cavity of CB7 and CB8 has been described by Kim and co-workers, who reported that the methyl viologen cation radical (MV~+') dimer is strongly stabilised following the formation of the inclusion complex CB8·(MV~+')2.~[11, 12] The inclusion complexation of diquat and paraquat by CB8 was instead investigated by Kaifer and coworkers, who found that one-electron reduction of diquat led to increased binding affinity with the macrocycle.~[13] Despite the many interesting studies involving CB8 and persistent radicals, no information has yet been obtained on the inclusion of nitroxide radicals by CB8. Complexation of a sterically hindered nitroxide (2,2,6,6-tetramethyl piperidine-N-oxyl, 1) and of benzyl tert-butyl nitroxide by CB7 in aqueous solution was instead reported in our previous paper.~[14] EPR spectroscopy was used to obtain evidence for the formation of the nitroxide·CB7 complex, both in the absence and in the presence of metal cations, on the basis of the large changes of the measured nitrogen hyperfine splitting, due to the different polar environment experienced by the included radical.
机译：葫芦[n] urils（CBn，其中n = 5-10）〜[1-7]和环糊精CD）〜[8-10]是两种不同的宿主分子，近年来由于它们的特殊性而引起了极大的关注结构和涉及与客体分子相互作用的应用。特别是，Kim和同事描述了自由基阳离子在CB7和CB8空腔中的特定包含，他们报告说，形成包含物后，甲基紫精阳离子自由基（MV〜+'）二聚体被稳定化了。复杂的CB8·（MV〜+'）2.〜[11，12] Kaifer和他的同事研究了CB8对敌草快和百草枯的包合络合作用，他们发现敌草快的单电子还原导致与草甘膦的结合亲和力增加。 [13]尽管有许多有趣的研究涉及CB8和持久性自由基，但尚未获得有关CB8包含一氧化氮自由基的信息。我们在先前的论文中报道了CB7在水溶液中使位阻硝基氧（2,2,6,6-四甲基哌啶-N-氧基，1）与苄基叔丁基硝基氧络合。[14] EPR光谱由于被测氮的超极性环境不同，被测氮超细裂的变化很大，因此，在存在和不存在金属阳离子的情况下，我们用它来获得形成氮氧化物·CB7络合物的证据。包括激进。

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