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中文题名:

 以心环烯为构筑基元的手性富碳分子的合成和性能研究    

姓名:

 杨洋    

保密级别:

 公开    

论文语种:

 chi    

学科代码:

 070303    

学科专业:

 有机化学    

学生类型:

 硕士    

学位:

 理学硕士    

学位类型:

 学术学位    

学位年度:

 2023    

校区:

 北京校区培养    

学院:

 化学学院    

研究方向:

 有机化学    

第一导师姓名:

 龚汉元    

第一导师单位:

 化学学院    

提交日期:

 2023-06-19    

答辩日期:

 2023-05-30    

外文题名:

 Synthesis and Characterization of Chiral Carbon-rich Molecules Containing Corannulene Moiety    

中文关键词:

 心环烯 ; 螺烯 ; 曲面富碳分子 ; 手性    

外文关键词:

 Corannulene ; Helicene ; Curved carbon-rich molecules ; Chirality    

中文摘要:

心环烯是构筑曲面富碳分子的常用结构基元。本文利用Diels-Alder和Scholl反应,成功合成了两种基于心环烯构筑的曲面分子CHH和CMH。X射线衍射实验证实了CHH和CMH的结构。CHH结构中心环烯通过一个七元环和两个六元环与两个HBC连接,心环烯和七元环使得CHH同时具有正曲率和负曲率,同时,扭曲的结构使得[5]螺烯具备更高的手性稳定性。CHH吸收光谱显示其在300 nm到650 nm的广泛吸收,荧光光谱显示CHH具有橙色的荧光 (λem = 576 nm) ,荧光量子产率为4.8%。借助手性高效液相色谱实现了CHH的光学拆分,光学纯的CHH的CD光谱呈现良好的镜像关系,在371 nm和510 nm处gabs = 2.8 × 10-3。CPL光谱显示,CHH在580 nm处,glum = 1.4 × 10-3。在CMH的晶体中,CMH骨架中的心环烯通过六元环和HBC连接,凸面朝向CMP单元。与不带取代基的CMP的接近平面的构象相比,CMH中的CMP单元呈现椅式构象。在溶液中观察到了心环烯翻转过程,变温1H NMR中,能够观察到信号的融合。吸收光谱显示CMH在300到500 nm的显著吸收,荧光光谱显示CMH具有绿色荧光 (λem = 491 nm) 。

外文摘要:

Corannulene is widely used to construct curved carbon-rich molecule. Herein, two curved molecules (i.e., CHH and CMH) containing corannulene moiety were generated. Both CHH and CMH were confirmed by X-ray diffraction analysis. The corannulene on CHH is connected to two HBCs with a seven-membered ring and two six-membered rings. The corannulene and seven-membered rings give CHH both positive and negative curvature. Meanwhile, the twisted structure led [5]helicene with higher chiral stability. CHH show a wide absorption range from 300 to 650 nm, and orange fluorescence (λem = 576 nm); the fluorescence quantum yield as 4.8%. The optical separation of CHH was achieved via chiral HPLC, the CD spectra of optically pure CHH show a good mirror relation with gabs as 2.8 × 10-3 at 371 nm and 510 nm. CPL spectra showed that CHH displays glum = 1.4 × 10-3 at 580 nm. In CMH, the corannulene connect HBC by a six-membered ring, with a convex surface toward the CMP unit. Compared with plan CMP without substituents, the CMP unit in CMH presents a chair conformation. The inversion process of corannulene was observed in solution, and the signal fusion was observed in 1H NMR with variable temperature. CMH has absorption from 300 to 500 nm, and green fluorescence (λem = 491 nm).

参考文献总数:

 107    

馆藏号:

 硕070303/23011    

开放日期:

 2024-06-19    

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