...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Dynamic Chemical Devices: Generation of Reversible Extension/Contraction Molecular Motion by Ion-Triggered Single/Double Helix Interconversion
【24h】

Dynamic Chemical Devices: Generation of Reversible Extension/Contraction Molecular Motion by Ion-Triggered Single/Double Helix Interconversion

机译：动态化学装置：通过离子触发的单/双螺旋互变生成可逆的伸缩分子运动

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 polyheterocyclic strands 1-H and 2-H adopt a helical shape enforced by the pyridine-pyrimidne heicity condon. The crystal structure of 2-H shows the formation of stacks of dimers of right-and left-handed individual helices. Treatment of 1-H and 2-H with silvar triflate results in the generation of double-helical entities 1-DH and 2-DH, containing two strands and two silver ions. NMR studies and determination of the crystal structure of 2-DH indicate that the duplex is stabilized by coordination of each Ag~+ on to two terminal bipyridine units, one from each strand, and by pronounced pi-pi stacking intractions between the internal heterocycles of the strands, yielding a very robust double helical strucuture. Reversible interconversion of the single and double helix may be achieved by addition of a cryptand capable of sequesting Ag~+ and relasing it by protonation. Thus, successive addition of acid and base leads to reversible interconversion between the shorter (approx 3.6 A) single helix and the long (approx 10.3 A) double helix, resulting in the generation of pronounced extension/contraction motion. The system 1,2-H/1,2-DH represents a dynamic chemical device undergoing ionic modulation of reversible molecular mechanical motion fueled by acid/base neutralization.
机译：多杂环链1-H和2-H采用由吡啶-嘧啶高平度密码子增强的螺旋形状。 2-H的晶体结构显示出右手和左手单个螺旋的二聚体的堆叠。用三氟甲磺酸三氟甲磺酸盐处理1-H和2-H导致生成包含两个链和两个银离子的双螺旋实体1-DH和2-DH。 NMR研究和2-DH晶体结构的确定表明，通过将每个Ag〜+与两个末端联吡啶单元（每个链中的一个）配位，并通过内部杂环之间明显的pi-pi堆积吸引，可使双链体稳定。股线，产生非常坚固的双螺旋结构。单螺旋和双螺旋的可逆相互转化可以通过添加能够螯合Ag〜+并通过质子化将其释放的穴状配体实现。因此，连续添加酸和碱会导致较短的（大约3.6 A）单螺旋和较长的（大约10.3 A）双螺旋之间可逆的相互转化，从而导致产生明显的延伸/收缩运动。系统1,2-H / 1,2-DH代表一种动态化学装置，该装置经历了由酸/碱中和作用推动的可逆分子机械运动的离子调制。

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