• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Highly Functionalized Dimeric Tetraethynylethenes and Expanded Radialenes:Strong Evidence for Macrocyclic Cross-Conjugation
【24h】

Highly Functionalized Dimeric Tetraethynylethenes and Expanded Radialenes:Strong Evidence for Macrocyclic Cross-Conjugation

机译：高度功能化的二乙基四乙炔和扩大的Rad烯：大环交叉共轭的有力证据。

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

A selection of dimeric tetra-ethynylethenes (TEEs)and perethyn-ylated expanded radialenes,containing different donor/acceptor substitution patterns,have been prepared and fully characterized.The first X-ray crystal structure of an expanded [6] radialene.with twelve peripherla 3,5-di(tert-butyl)-phenyl substituents,is presented.This mactocycle,the all-carbon core of which is isomeric with fullerene C_(60) adopts a non-planar,"chair-like" conformation Also a TEE dimer,carrying N,N-di-methylaniline donor substituents,has been subjected to an X-ray crystall0-graphic analysis The electronic proper-ties were studied by UV/Vis spectros-copy and electrochemistry,providing fundamental insight into mechanisms of #pi#-electron delocalization in the acy-clic and macrocyclic chromophores.Do-nor or donor-acceptor-substituted di-meric TEE derivtives show very strong absorptions extending over the entire absorption bands have high charge-transfer character.Macrocyclic cross-conjugation in the expanded radialenes becomes increasingly efficient with in-creasing donor-acceptor polarization.A dual,strongly solvent-polarity-de-pendent fluorescence was observed for a tetrakis(N,N-dimethyaniline)-substi-tuted dimeric TEE;this interesting emission behavior is explained by the twisted intramolecular charge-transfer(TICT)state model .Donor-substituted expanded radialenes display huge reso-nance-enhanced third-order nonlinear optical coefficients
机译：制备并充分表征了二聚四乙炔基（TEE）和经乙炔基化的膨胀的烯烯的选择，并对其进行了充分表征。膨胀的[6] radial烯的第一个X射线晶体结构具有十二个外围。给出了3,5-二（叔丁基）-苯基取代基。该甲基环的全碳核与富勒烯C_（60）异构，采用非平面的“椅子状”构象，也是TEE对带有N，N-二甲基苯胺供体取代基的二聚体进行了X射线晶体图分析。通过UV / Vis光谱和电化学研究了电子性质，为#pi机理提供了基本见识。在正负电子和大环发色团中电子＃离域化。正或供体受体取代的二聚TEE衍生物在整个吸收带上均显示出很强的吸收，具有高电荷转移特性。扩大了随着供体-受体极化的增加，径向烯变得越来越有效。对四（N，N-二甲基苯胺）-取代的二聚TEE观察到双重的，溶剂极性依赖性的荧光;解释了这种有趣的发射行为通过扭曲的分子内电荷转移（TICT）状态模型。供体取代的膨胀径向烯显示出巨大的共振增强的三阶非线性光学系数

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