...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Different metal-ion-induced dimeric self-assembling cavities based on thiacalix[4]benzocrown-4 isomers
【24h】

Different metal-ion-induced dimeric self-assembling cavities based on thiacalix[4]benzocrown-4 isomers

机译：基于硫杂杯[4] benzocrown-4异构体的不同金属离子诱导的二聚体自组装腔

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

To construct the self-assembly of metal-ion-induced well-ordered architectures based on calixcrowns, isomeric thiacalix[4]benzocrowns-4 1 and 2 with rigid and small crown units were employed as the new scaffolds. They all show remarkable selectivity for Ag~+ and their complexation ability towards Ag~+ results in two novel dimeric aggregates of calixcrowns, which were first evidenced by ESI-MS, ~1H and DOSY-NMR spectra. Ultimately, X-ray diffraction experiments confirmed unambiguously the existence of the two metal-ion-induced dimers in lower rim/lower rim mode, and showed that dimerization of calixcrown 1 or 2 in the presence of Ag~+ could form dimeric supramolecular cavity with a small inner room. Moreover, the positional isomerism of their crown units (o-benzocrown unit for ligand 1 and m-benzocrown unit for 2) led to a dramatic change in the configuration of the two dimeric cavities 1·Ag~+ and 2·Ag~+. For dimeric cavity 1·Ag~+, two silver centers seamed two thiacalix[4]crown molecules together and resided at the edge of the dimeric self-assembling cavity; for dimeric cavity 2·Ag~+, one Ag~+ stitched two thiacalixcrowns together and was encapsulated in the center of the self-assembling cavity, while the other Ag~+ is tied down to one end of the dimer. Consequently, as a result of the different construction of dimeric cavities 1·Ag+ and 2·Ag~+ the extended structures of the complexes are also different. The neighbour self-assembling cavities 1·Ag~+ are mutually oriented side-by-side and form a 1-D rectilineal polymeric chain. While, the neighbour self-assembling cavities 2·Ag~+ arrange themselves in a typical head-to-tail fashion to form a zig-zag polymeric chain.
机译：为了构建基于杯形冠的金属离子诱导的有序结构的自组装，采用具有刚性和小冠单元的异构体噻卡利克斯[4]苯并冠-4-1和2作为新支架。它们都显示出对Ag〜+的显着选择性，并且它们对Ag〜+的络合能力导致了两种新的杯形二聚体聚集体，这首先由ESI-MS，〜1H和DOSY-NMR光谱证明。最终，X射线衍射实验明确证实了在下边缘/下边缘模式下两个金属离子诱导的二聚体的存在，并表明在Ag〜+存在下杯形冠1或2可以二聚形成超分子腔。一个小的内部房间。而且，它们的冠单元（配体1的邻苯并冠单元和2的间苯并冠单元）的位置异构导致了两个二聚体腔1·Ag〜+和2·Ag〜+的构型的巨大变化。对于二聚体腔1·Ag〜+，两个银中心将两个thiacalix [4]冠状分子缝合在一起，并位于二聚体自组装腔的边缘。对于二聚体腔2·Ag〜+，一个Ag〜+将两个硫杂杯形王冠缝合在一起，并被封装在自组装腔的中心，而另一个Ag〜+被束缚到二聚体的一端。因此，由于二聚体腔1·Ag +和2·Ag〜+的结构不同，复​​合物的延伸结构也不同。相邻的自组装腔1·Ag〜+相互并排取向，并形成一维直角聚合物链。同时，邻居的自组装腔2·Ag〜+以典型的头尾相接的方式排列以形成之字形聚合物链。

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