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Unlike conventional alternant hydrocarbons (e.g., benzene\u2010derived systems), nonalternant architectures exhibit distinct electron confinement effects, making them promising for nanoscale optoelectronics and quantum materials. However, achieving precise control over their length, solubility, and structural regularity has had limited progress. Herein, we report a versatile solution\u2010phase synthesis of a novel family of structurally precise <jats:italic>N<\/jats:italic>\u2010doped nonalternant nanoribbons (<jats:bold>NRs<\/jats:bold>: <jats:bold>NR\u201011<\/jats:bold> to <jats:bold>NR\u201029<\/jats:bold>) through pentagon annulation of pyrazino[2,3\u2010<jats:italic>g<\/jats:italic>]quinoxaline and naphthalene subunits terminated with triptycene end\u2010caps. The longest one comprises 29 linearly fused rings (particularly including 10 pentagonal rings), setting a new length record of 7.18\u00a0nm among the soluble nonalternant <jats:bold>NRs<\/jats:bold> reported to date. Strategic incorporation of triptycene end\u2010caps and alkoxyphenyl substituents into their molecular backbones confers high solubility and a unique 3D configuration, enabling comprehensive solution\u2010phase structural characterization and systematic investigation of length\u2010dependent optoelectronic properties. Employing terahertz (THz) spectroscopy, we infer high intrinsic charge carrier mobilities in nonalternant nanoribbons, reaching up to \u223c2000 cm<jats:sup>2<\/jats:sup>\u00a0V<jats:sup>\u22121<\/jats:sup>\u00a0s<jats:sup>\u22121<\/jats:sup>, highlighting this novel family of nanoribbons as promising candidates for future nanoelectronic applications.<\/jats:p>","DOI":"10.1002\/anie.202514214","type":"journal-article","created":{"date-parts":[[2025,8,21]],"date-time":"2025-08-21T10:40:09Z","timestamp":1755772809000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["<i>N<\/i>\u2010Doped Nonalternant Nanoribbons with up to 29 Linearly\u2010Fused Rings and High Charge\u2010Carrier Mobilities"],"prefix":"10.1002","volume":"64","author":[{"given":"Xi","family":"He","sequence":"first","affiliation":[{"name":"Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry Xiangtan University  Xiangtan 411105 P.R. 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