{"title":"Excited-state proton transfer of weak and medium-strength photoacids in confined methanol-in-oil reverse micelles","authors":"Taehyung Jang, Yoonsoo Pang","doi":"10.1002/bkcs.70034","DOIUrl":null,"url":null,"abstract":"<p>This study explores the excited-state proton transfer (ESPT) dynamics of weak and medium-strength photoacids, 8-hydroxypyrene-1,3,6-trisulfonic trisodium salt (pyranine; HPTS), D-luciferin, and 2-cyano-6-hydroxybenzothiazole (CBTOH), confined within <i>water-in-oil</i> and <i>methanol-in-oil</i> reverse micelles (RMs). We extend the previous work on the ESPT dynamics of HPTS in Igepal RMs to several weak or medium-strength photoacids confined in the RMs. These photoacids exhibit proton transfer rate constants on the order of 10<sup>9</sup> s<sup>−1</sup> in small RMs, which are comparable to the solvation dynamics inside the RMs. This suggests that the solvation dynamics govern the ESPT rates in the RMs, irrespective of the core polar solvent characteristics.</p>","PeriodicalId":54252,"journal":{"name":"Bulletin of the Korean Chemical Society","volume":"46 7","pages":"658-665"},"PeriodicalIF":2.2000,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of the Korean Chemical Society","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/bkcs.70034","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
This study explores the excited-state proton transfer (ESPT) dynamics of weak and medium-strength photoacids, 8-hydroxypyrene-1,3,6-trisulfonic trisodium salt (pyranine; HPTS), D-luciferin, and 2-cyano-6-hydroxybenzothiazole (CBTOH), confined within water-in-oil and methanol-in-oil reverse micelles (RMs). We extend the previous work on the ESPT dynamics of HPTS in Igepal RMs to several weak or medium-strength photoacids confined in the RMs. These photoacids exhibit proton transfer rate constants on the order of 109 s−1 in small RMs, which are comparable to the solvation dynamics inside the RMs. This suggests that the solvation dynamics govern the ESPT rates in the RMs, irrespective of the core polar solvent characteristics.
期刊介绍：
The Bulletin of the Korean Chemical Society is an official research journal of the Korean Chemical Society. It was founded in 1980 and reaches out to the chemical community worldwide. It is strictly peer-reviewed and welcomes Accounts, Communications, Articles, and Notes written in English. The scope of the journal covers all major areas of chemistry: analytical chemistry, electrochemistry, industrial chemistry, inorganic chemistry, life-science chemistry, macromolecular chemistry, organic synthesis, non-synthetic organic chemistry, physical chemistry, and materials chemistry.
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