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It was revealed that there is a good relationship between the most positive surface electrostatic potential (\n                    <jats:italic>V<\/jats:italic>\n                    <jats:sub>S,max<\/jats:sub>\n                    ) values associated with the most positive\n                    <jats:italic>\u03c3<\/jats:italic>\n                    \u2010hole on halogen atoms in organohalogen molecule and the\n                    <jats:italic>\u03bb<\/jats:italic>\n                    <jats:sub>max<\/jats:sub>\n                    <jats:sup>abs<\/jats:sup>\n                    , indicating that the b\u2010OHC of the D\u2013A and D\u2010\u03c0\u2010A pyridinium dyes is attributed to the formation of halogen bond (XB) or complex such as [R\u2500X\u00b7Y]\n                    <jats:sup>\u2212<\/jats:sup>\n                    between the halogen atom (X) of organohalogen molecule and the counter anion (Y) of dye molecule. Moreover, the plots of the\n                    <jats:italic>\u03bb<\/jats:italic>\n                    <jats:sub>max<\/jats:sub>\n                    <jats:sup>abs<\/jats:sup>\n                    against the\n                    <jats:italic>V<\/jats:italic>\n                    <jats:sub>S,max<\/jats:sub>\n                    values demonstrated that the b\u2010OHC characteristic of D\u2013A pyridinium dye is lower than that of the D\u2010\u03c0\u2010A pyridinium dye. It was suggested that the formation of XB induces a decrease in the ring current of the pyridinium ring, that the LUMO is mainly localized, resulting in the expression of b\u2010OHC. Consequently, this work offers a deeper insight into the mechanism for the expression and the origin of OHC.\n                  <\/jats:p>","DOI":"10.1002\/asia.202500746","type":"journal-article","created":{"date-parts":[[2025,6,23]],"date-time":"2025-06-23T06:29:30Z","timestamp":1750660170000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Elucidation of Organohalogenochromism (OHC) of D\u2013A Pyridinium and D\u2010\u03c0\u2010A Pyridinium Dyes: Effect of Halogen Bond"],"prefix":"10.1002","volume":"20","author":[{"given":"Kumpei","family":"Kozuka","sequence":"first","affiliation":[{"name":"Applied Chemistry Program Graduate School of Advanced Science and Engineering Hiroshima University  1\u20104\u20101 Kagamiyama, Higashi Hiroshima 739\u20108527 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Keiichi","family":"Imato","sequence":"additional","affiliation":[{"name":"Applied Chemistry 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