Two I(h)-symmetry-breaking C60 isomers stabilized by chlorination.
Two I(h)-symmetry-breaking C60 isomers stabilized by chlorination.
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DOI：
10.1038/nmat2275
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发表时间：
2008
期刊：
影响因子：
41.2
通讯作者：
Yuanzhi Tan;Zhao-Jiang Liao;Zhuo-Zhen Qian;Rui-ting Chen;Xin Wu;Hua Liang;Xiao Han;Feng Zhu
中科院分区：
文献类型：
--
作者：
Yuanzhi Tan;Zhao-Jiang Liao;Zhuo-Zhen Qian;Rui-ting Chen;Xin Wu;Hua Liang;Xiao Han;Feng Zhu
富勒烯科学中一个令人惊讶的发现是，1h-对称巴克敏斯特富勒烯C60（Ih-C60或#1，812 C60，由对称性或福勒螺旋算法指定的命名法）仍然是实验上唯一可用的C60物种。将它与其他1，811种拓扑异构体（isobuckminsterfullerenes）区分开来的是它唯一符合孤立五边形规则，该规则规定稳定的富勒烯具有孤立的五边形。虽然气相中存在的异富勒烯一直被怀疑，在这里，我们报告的实现两个isobuckminster富勒烯通过氯化分别C2 v-和Cs-对称的C60笼。这些氯化物，#1，809 C60 Cl_8（1）和#1，804 C60 Cl_（12），在实验上是有用的。通过晶体学的结构表征明确建立了独特的五边形-五边形环融合。这些独特的结构特征是直接负责在随后的氯取代观察到的区域选择性，也使这些前所未有的衍生物的C60异构体重要的解决长期存在的难题富勒烯形成的斯通-威尔士变换方案，。
One abiding surprise in fullerene science is thatIh-symmetric buckminsterfullerene C60(ref. ) (Ih–C60or#1,812C60, the nomenclature specified by symmetry or by Fowler’s spiral algorithm) remains the sole C60species experimentally available. Setting it apart from the other 1,811 topological isomers (isobuckminsterfullerenes) is its exclusive conformity with the isolated-pentagon rule, which states that stable fullerenes have isolated pentagons. Although gas-phase existence of isobuckminsterfullerenes has long been suspected,,,, synthetic efforts have yet to yield successful results. Here, we report the realization of two isobuckminsterfullerenes by means of chlorination of the respectiveC2v- andCs-symmetric C60cages. These chlorinated species,#1,809C60Cl8(1) and#1,804C60Cl12(2), were isolated in experimentally useful yields. Structural characterization by crystallography unambiguously established the unique pentagon–pentagon ring fusions. These distinct structural features are directly responsible for the regioselectivity observed in subsequent substitution of chlorines, and also render these unprecedented derivatives of C60isomers important for resolving the long-standing puzzle of fullerene formation by the Stone–Wales transformation scheme,,,.