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Double aromaticity in monocyclic carbon, boron, and borocarbon rings based on magnetic criteria

机译:基于磁性标准的单环碳,硼和硼碳环中的双芳香性

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摘要

The double-aromatic character of selected monocyclic carbon, boron, and borocarbon rings is demonstrated by refined nucleus-independent chemical shift (NICS) analyses involving the contributions of individual canonical MOs and their out-of-plane NICS tensor component (CMO-NICSzz). The double aromaticity considered results from two mutually orthogonal Huckel p AO frameworks in a single molecule. The familiar a orbitals are augmented by the in-plane delocalization of electrons occupying sets of radial (rad) p orbitals. Such double aromaticity is present in B-3(-), C6H3+, C(6)(4+)6+, C4B44+, C-6, C5B2, C4B4, C2B8, B-10(2-), B-12, C-10, C9B2, C8B4, C7B6, C6B8, and C-14. Monocyclic C-8 and C-12 are doubly antiaromatic, as both the orthogonal pi and radial Huckel sets are paratropic. Planar C-7 and C-9 monocycles have mixed aromatic (a) and antiaromatic (radial) systems.
机译:精制的与核无关的化学位移(NICS)分析证明了所选单环碳环,硼环和硼碳环的双芳族特征,涉及单个规范MO及其平面外NICS张量分量(CMO-NICSzz)的贡献。所考虑的双重芳香性是由单个分子中的两个相互正交的Huckel p AO骨架产生的。电子的平面内离域占据了径向(rad)p轨道的集合,从而扩大了熟悉的轨道。 B-3(-),C6H3 +,C(6)(4+)6 +,C4B44 +,C-6,C5B2,C4B4,C2B8,B-10(2-),B-12, C-10,C9B2,C8B4,C7B6,C6B8和C-14。单环C-8和C-12具有双重抗芳香性,因为正交pi和径向Huckel集均为顺性的。平面C-7和C-9单环具有混合的芳族(a)和抗芳族(径向)系统。

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