• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Electronic Transitions in Conformationally Controlled Tetrasilanes with a Wide Range of SiSiSiSi Dihedral Angles
【24h】

Electronic Transitions in Conformationally Controlled Tetrasilanes with a Wide Range of SiSiSiSi Dihedral Angles

机译：具有大范围SiSiSiSi二面角的结构受控的四硅烷中的电子跃迁

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

Unlike π-electron chromophores, the peralkylated n-tetrasilane s-electron chromophore resembles a chameleon in that its electronic spectrum changes dramatically as its silicon backbone is twisted almost effortlessly from the syn to the anti conformation (changing the SiSiSiSi dihedral angle w from 0 to 180°). A combination of UV absorption, magnetic circular dichroism (MCD), and linear dichroism (LD) spectroscopy on conformationally controlled tetrasilanes 1–9, which cover fairly evenly the full range of angles ω, permitted a construction of an experimental correlation diagram for three to four lowest valence electronic states. The free chain tetrasilane n-Si_4Me_(10) (10), normally present as a mixture of three enantiomeric conformer pairs of widely different angles ω, has also been included in our study. The spectral trends are interpreted in terms of avoided crossings of 1B with 2B and 2A with 3A states, in agreement with SAC-CI calculations on the excited states of 1–7 and conformers of 10.
机译：与π电子发色团不同，全烷基化的n-四硅烷s电子发色团类似于变色龙，因为其电子骨架几乎毫不费力地从合成构象扭转到反构象（其SiSiSiSi二面角w从0更改为反构象），其电子光谱急剧变化180°）。构象控制的四硅烷1–9的UV吸收，磁性圆二色性（MCD）和线性二色性（LD）光谱相结合，可以相当均匀地覆盖角度ω的整个范围，因此可以构建三个到三个最低价的四个电子态。我们的研究还包括通常以三种不同角度ω的对映异构构象对的混合物形式存在的自由链四硅烷n-Si_4Me_（10）（10）。根据避免1B与2B交叉和2A与3A状态交叉的方式来解释频谱趋势，这与SAC-CI对1-7的激发态和10的构象异构体的计算相一致。

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