In this paper, topological resonance energy (TRE) methods were used to describe the global aromaticity of nitrogen confused porphyrin (NCP) isomers. The TRE results show that all NCP isomers exhibit lower aromaticity than the normal porphyrins, and their aromaticity decreases as the number of confused pyrrole rings in the molecule increases. In the NCPs, global aromaticity decreases as the distance between the nitrogen atoms increases. The bond resonance energy (BRE) and circuit resonance energy (CRE) indices were applied to study local aromaticity and conjugated pathways. Both the BRE and CRE indices revealed that individual pyrrolic subunits maintain their strong aromatic character and are the main source of global aromaticity. Ring currents (RC) were analysed using the Hückel–London model. RC results revealed that the macrocyclic electron conjugation pathway is the main source of diatropicity. As the number of confused pyrrole rings in the molecule increases, its diatropicity gradually decreases. In the confused pyrrole rings of the NCP isomers, the diatropic RC passing through the β-positions is always weaker than that passing through the inner sections. This is unrelated to the location of the protonated or non-protonated nitrogen atom at the periphery of the molecule and must be ascribed to the unique properties of the confused pyrrole rings.

本文使用拓扑共振能量（TRE）方法描述了氮杂卟啉（NCP）异构体的整体芳香性。TRE结果表明，所有NCP异构体都比正常的卟啉具有较低的芳香性，并且随着分子中吡咯环的数目增加，其芳香性降低。在NCP中，整体芳香性随氮原子之间距离的增加而降低。结合共振能（BRE）和电路共振能（CRE）指数用于研究局部芳香性和共轭途径。BRE和CRE指数均显示，各个吡咯亚基保持其强大的芳香​​性，并且是全球芳香性的主要来源。使用Hückel-London模型分析了振铃电流（RC）。RC结果表明，大环电子共轭途径是变质的主要来源。随着分子中稠合吡咯环数量的增加，其变径性逐渐降低。在NCP异构体的稠合吡咯环中，变径RC通过β位置总是比通过内部部分的位置弱。这与质子化或非质子化氮原子在分子外围的位置无关，并且必须归因于混淆的吡咯环的独特性质。