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We find that <jats:bold>1<\/jats:bold> does not display significantly dynamic acidity in the excited state, that is, it is not a photoacid. Three protonation states of <jats:bold>1<\/jats:bold> were investigated, all of which, neutral, singly protonated, and bis\u2010protonated, are fluorescent. As an isolable model for the mono\u2010protonated species, a methylated derivative of <jats:bold>1<\/jats:bold> was prepared by reaction with methyl triflate. This species displays redshifted emission but similar absorption as the non\u2010quaternized parent, <jats:bold>1<\/jats:bold>. The strong observed emission of all three protonated states of <jats:bold>1<\/jats:bold> suggests that the kinetic photoacidity of <jats:bold>1<\/jats:bold>* is low or absent. We assume that the lifetime of the excited state is too short to allow solvent reorganization and therefore we cannot make a statement on the thermodynamic photoacidity of the protonated forms of <jats:bold>1<\/jats:bold>.<\/jats:p>","DOI":"10.1002\/chem.200900608","type":"journal-article","created":{"date-parts":[[2009,10,26]],"date-time":"2009-10-26T10:10:25Z","timestamp":1256551825000},"page":"13075-13081","source":"Crossref","is-referenced-by-count":30,"title":["Bis(4\u2032\u2010dibutylaminostyryl)benzene: Spectroscopic Behavior upon Protonation or Methylation"],"prefix":"10.1002","volume":"15","author":[{"given":"Anthony\u2005J.","family":"Zucchero","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juan","family":"Tolosa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laren\u2005M.","family":"Tolbert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Uwe\u2005H.\u2005F.","family":"Bunz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2009,12]]},"reference":[{"key":"e_1_2_5_1_2","unstructured":"\u00a0"},{"key":"e_1_2_5_2_2","doi-asserted-by":"publisher","DOI":"10.1007\/3-540-49451-0_5"},{"key":"e_1_2_5_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1521-3757(19980216)110:4<416::AID-ANGE416>3.0.CO;2-N"},{"key":"e_1_2_5_3_3","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1521-3773(19980302)37:4<402::AID-ANIE402>3.0.CO;2-9"},{"key":"e_1_2_5_4_2","unstructured":"\u00a0"},{"key":"e_1_2_5_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0021-9258(19)83641-4"},{"key":"e_1_2_5_6_2","doi-asserted-by":"publisher","DOI":"10.1021\/bi00552a018"},{"key":"e_1_2_5_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/bc000069w"},{"key":"e_1_2_5_8_2","unstructured":"\u00a0"},{"key":"e_1_2_5_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0010-8545(00)00246-0"},{"key":"e_1_2_5_10_2","doi-asserted-by":"publisher","DOI":"10.1021\/j100119a050"},{"key":"e_1_2_5_11_2","unstructured":"\u00a0"},{"key":"e_1_2_5_12_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200305299"},{"key":"e_1_2_5_13_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.0406547102"},{"key":"e_1_2_5_14_2","doi-asserted-by":"publisher","DOI":"10.1021\/j100346a099"},{"key":"e_1_2_5_15_2","doi-asserted-by":"crossref","first-page":"1670","DOI":"10.1051\/jcp\/1996931670","volume":"93","author":"Jonusauskas G.","year":"1996","journal-title":"J. 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