Aromaticity, one of the most fundamental concepts in chemistry, can be classified as Hückel- and Möbius-type according to the electron count and topology. In comparison with numerous Hückel aromatics containing 4n+2 π-electrons, Möbius aromatics with 4n π-electrons, especially the Craig-type species are particularly limited. Herein we demonstrate that the recently synthesized dimetalla[10]annulenes could be Möbius aromatic or antiaromatic although the organic prototype [10]annulene is nonaromatic due to the nonplanarity caused by the steric repulsion of two CH groups, suggesting the first example of yin-and-yang pair with Craig-type Möbius (anti)aromaticity. Further study suggests that the lithium atoms in dimetalla[10]annulenes are not spectator cations but play an important role in the aromaticity switch of these species due to their bonding interaction with the diene moieties. Our findings highlight the magic power of metals in the achievement of Craig-type Möbius aromatics, thus opening an avenue to such novel aromatics.

中文翻译：

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双金属[10]环烯中的克雷格型莫比乌斯芳香性和抗芳香性：金属诱导的阴阳对

芳香性是化学中最基本的概念之一，根据电子数量和拓扑结构，可以分为Hückel型和Möbius型。在用含有4众多休克尔芳烃比较Ñ 2π电子，具有4莫比乌斯芳烃Ñπ电子，尤其是克雷格（Craig）型物质受到特别限制。本文中，我们证明，尽管有机原型[10]环戊烯由于两个CH基团的空间排斥引起的非平面性而成为非芳香族化合物，但最近合成的双金属[10]环烯可能是莫比乌斯芳族或抗芳族化合物，这表明了银和环的第一个例子杨对与克雷格（Craig）型莫比乌斯（反）芳香性。进一步的研究表明，双金属[10]环戊烯中的锂​​原子不是旁观者阳离子，但由于它们与二烯部分的键合相互作用，在这些物种的芳香性转换中起着重要作用。我们的发现凸显了金属在实现克雷格（Craig）型莫比乌斯（Möbius）芳香族化合物方面的魔力，从而为此类新型芳香族化合物开辟了道路。