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Despite this seemingly minor structural perturbation, LEAs exhibit electronic behavior fundamentally distinct from their PA counterparts. Herein, we systematically investigate the electronic structure and magnetic aromaticity of a series of LEAs in their , , and \u00a0states. We find that LEAs begin to exhibit biradical character at smaller molecular sizes than the corresponding PAs, driven by preferential localization of unpaired electrons on the terminal rings, which allows for the formation of a migrating Clar sextet in the central benzenoid chain and results in a distinctive pattern of paratropic terminal domains and diatropic central domains. This same preference causes the two families to show opposite locations of unpaired electrons in . In , it results in a superposition of the two \u2010state patterns, whereby LEAs localize unpaired electrons at the terminal rings while the benzenoid core adopts the PA\u2010like arrangement. Together, these results deepen our understanding of non\u2010benzenoid open\u2010shell molecules and underscore the critical role of ring topology in governing electronic structure and aromatic character.<\/jats:p>","DOI":"10.1002\/jcc.70504","type":"journal-article","created":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T03:58:08Z","timestamp":1790567888000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Linearly Expanded Azulenes in the S0, T1, and Qu1 States: A Unified View of Electronic Structure and Aromaticity"],"prefix":"10.1002","volume":"47","author":[{"given":"Pallavi","family":"Sarkar","sequence":"first","affiliation":[{"name":"Schulich Faculty of Chemistry and the Resnick Sustainability Center for Catalysis Technion \u2010 Israel Institute of Technology  Haifa 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