Highly Curved Bowl-Shaped Fragments of Fullerenes: Synthesis, Structural Analysis, and Physical Properties
作者:Min-Kuan Chen、Hsin-Ju Hsin、Tsun-Cheng Wu、Bo-Yan Kang、Yen-Wei Lee、Ming-Yu Kuo、Yao-Ting Wu
DOI:10.1002/chem.201303357
日期:2014.1.7
Highly curved buckybowls 3, 4, and 5 were synthesized from planar precursors, fluoranthenes 8, benzo[k]fluoranthenes 10 and naphtho[1,2‐k]‐cyclopenta[cd]fluoranthenes 12, respectively, using straightforward palladium‐catalyzed cyclization reactions. These fluoranthene‐based starting materials were easily prepared from 1,8‐bis(arylethynyl)naphthalenes 6. Both buckybowls 3 and 4 are fragments of C60
高度弯曲buckybowls 3,4和5是从平面的前体合成,荧蒽8,苯并[ ķ ]荧蒽10和萘并[1,2- ķ ]环戊二烯并[ CD ]荧蒽12,分别使用简单的钯催化环化反应。这些基于荧蒽的原料很容易由1,8-双(芳乙炔基)萘6制备。buckybowls 3和4都是C 60的片段,而5是C 70的唯一亚基。弯曲的结构通过X射线晶体学鉴定,它们是深碗。3和4的最大π轨道轴矢量(POAV)锥化角均为12.8°。如此高的曲率很少获得。Buckybowls 5的弯曲度较小,因为它们的五元环密度较低,类似于C 70的管部分。环戊环法增加了3和4的转鼓深度,但不是最大POAV金字塔化角度。在本文研究的八只buckybowl中,有五种形成极性晶体。这些buckybowls的碗对碗倒置动力学可以分为两种类型:一个具有平面过渡结构,而另一个具有S形过渡结构。这些buckybowls的较大的纵向长度对应于对后