首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Solid-state ~(13)C NMR investigations of cyclophanes: [2.2]paracyclophane and 1,8-dioxa[8](2,7)pyrenophane
【24h】

Solid-state ~(13)C NMR investigations of cyclophanes: [2.2]paracyclophane and 1,8-dioxa[8](2,7)pyrenophane

机译:环烷的固态〜(13)C NMR研究:[2.2]对环烷和1,8-二恶英[8](2,7)邻苯二甲ane

获取原文
获取原文并翻译 | 示例
           

摘要

Solid-state NMR (ssNMR) and ab initio quantum mechanical calculations are used in order to understand and to better characterize the molecular conformation and properties of [2.2]paracyclophane and 1,8-dioxa[8](2,7) pyrenophane. Both molecules are cyclophanes, consisting of an aromatic ring assembly and a cyclic aliphatic chain connected to both ends of the aromatic portion. The aliphatic chain causes curvature in the six-membered aromatic ring structures. This led us to examine how the ring strain due to curvature affects the chemical shifts. Using X-ray structures of both [2.2]paracyclophane and 1,8-dioxa[8](2,7)pyrenophane as our starting model, we calculate the chemical shielding tensors and compare these data with those collected from the 13C ssNMR FIREMAT experiment. We define curvature of [2.2]paracyclophane and 1,8-dioxa[8](2,7)pyrenophane using the π-orbital axis vector (POAV) pyramidalization angle (θ _p).
机译:使用固态NMR(ssNMR)和从头开始的量子力学计算是为了理解和更好地表征[2.2]对环环烷和1,8-二氧杂[8](2,7)en烷的分子构象和性质。两个分子都是环芳基,由芳族环​​组件和连接到芳族部分两端的环状脂族链组成。脂族链在六元芳族环结构中引起弯曲。这使我们研究了由于曲率引起的环应变如何影响化学位移。使用[2.2]对环环烷和1,8-二氧杂[8](2,7)邻苯二甲醚的X射线结构作为我们的初始模型,我们计算化学屏蔽张量,并将这些数据与从13C ssNMR FIREMAT实验收集的数据进行比较。我们使用π轨道轴矢量(POAV)锥化角(θ_p)定义[2.2]对环环烷和1,8-二恶英[8](2,7)邻苯二甲curvature的曲率。

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