F. Tomas Vert, P. Medina Casamayor, A. Olba Torrent, I.S. Monzo Mansanet
{"title":"The fluorescence and phosphorescence spectra of dimethylphenol at 77 K","authors":"F. Tomas Vert, P. Medina Casamayor, A. Olba Torrent, I.S. Monzo Mansanet","doi":"10.1016/0047-2670(87)87044-2","DOIUrl":null,"url":null,"abstract":"<div><p>The fluorescence and phosphorescence spectra of the dimethylphenols were studied at 77 K. Changes in the p<em>K</em><sub>a</sub> values in the excited singlet (S<sub>1</sub>) and triplet (T<sub>1</sub>) states for 2,3-, 2,4-, 2,5-, 2,6-, 3,4- and 3,5-dimethylphenol in ethanol and ethanol—NaOH solutions were estimated by means of the Förster cycle.</p><p>We found that the acidity of the hydroxyl group in the first excited singlet is greater than that in the ground state. This is also true for the first triplet state, although the acidity of the first triplet state of 2,6-dimethylphenol is an exception, owing to the influence of the methyl groups on the hydroxyl group.</p></div>","PeriodicalId":16771,"journal":{"name":"Journal of Photochemistry","volume":"40 1","pages":"Pages 59-65"},"PeriodicalIF":0.0000,"publicationDate":"1987-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0047-2670(87)87044-2","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Photochemistry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0047267087870442","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The fluorescence and phosphorescence spectra of the dimethylphenols were studied at 77 K. Changes in the pKa values in the excited singlet (S1) and triplet (T1) states for 2,3-, 2,4-, 2,5-, 2,6-, 3,4- and 3,5-dimethylphenol in ethanol and ethanol—NaOH solutions were estimated by means of the Förster cycle.
We found that the acidity of the hydroxyl group in the first excited singlet is greater than that in the ground state. This is also true for the first triplet state, although the acidity of the first triplet state of 2,6-dimethylphenol is an exception, owing to the influence of the methyl groups on the hydroxyl group.
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