The formation of carbon nanobelt made exclusively from fused benzene rings has recently been achieved. Our results reveal an interesting shift from a local aromatic character constrained in each of the six aromatic Clar sextets (6π-electron circuit) to a global aromatic character in charged species (+2 and −2) involving the overall π-circuit from the molecular nanobelt. This demonstrates the suppression of the local aromatic character in favor of a global aromaticity by selecting the oxidation state of the carbon nanobelt, giving rise to a shielding cone extended within the structure.

中文翻译：

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分子碳纳米带中的局部和全局芳香性：中性和带电物种的磁响应特性的见解†

最近已经实现了仅由稠合苯环制成的碳纳米带的形成。我们的结果揭示了一个有趣的变化，即从六个芳香族克拉尔六重音（6π电子电路）中的每一个受局限的局部芳香性变化到带电物种（+2和-2）中的全局芳香性（涉及分子的整体π电路）纳米带。这表明通过选择碳纳米带的氧化态抑制了局部芳香性，有利于整体芳香性，从而产生了在结构内延伸的屏蔽锥。