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Their unique packing patterns were clarified by X\u2010ray crystallographic analysis, which depend on the counter anions to influence their photophysical properties in the solid states. Notably, the interactions between \u03c0\u2010cation species and planar anion species lead to a unique panchromatic property, accompanying a near\u2010infrared absorption with a <jats:italic>\u03bb<\/jats:italic><jats:sub>onset<\/jats:sub> value of 1030\u2005nm, which can be assigned to intermolecular charge transfer transition. We found that the \u03c0\u2010cation species with planar anion formed cation dimers, being stacked in opposite directions. The two cation molecules are flanked by two anions on both the top and bottom side. Pair interaction energy decomposition analysis (PIEDA) calculations imply that the origins of the unique packing patterns of the \u03c0\u2010cations originate from the electrostatic forces of four neighbouring \u03c0\u2010anion species.<\/jats:p>","DOI":"10.1002\/chem.202404054","type":"journal-article","created":{"date-parts":[[2024,12,16]],"date-time":"2024-12-16T22:14:33Z","timestamp":1734387273000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Structural Characteristics of a Partially Planarized Triarylmethyl Cation with Unsymmetrical Push\u2013Pull Structure"],"prefix":"10.1002","volume":"31","author":[{"given":"Masato","family":"Ito","sequence":"first","affiliation":[{"name":"Department of Applied Chemistry for Environment Graduate School of Urban Environmental Sciences Tokyo Metropolitan University  1-1 Minami-Osawa, Hachioji Tokyo 192-0397 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