Comparison of the photoisomerization and relaxation processes studied by time resolved spectroscopic methods in two polymethine dyes with the same polymethine chromophor
{"title":"Comparison of the photoisomerization and relaxation processes studied by time resolved spectroscopic methods in two polymethine dyes with the same polymethine chromophor","authors":"S. Rentsch, U. Grummt, D. Khetchinashwili","doi":"10.1155/LC.7.261","DOIUrl":null,"url":null,"abstract":"A streptocyanine dye (BMC) and an oxadicarbocyanine (DODCI) were studied in the \npicosecond and millisecond time region. The comparison showed that for both dyes the \nfollowing parameters are nearly equal: the radiative lifetime, the difference between the \nabsorption maxima of the stable form and the photoisomer, the activation energy and \nthe frequency factor for the thermal backreaction and even the energy barrier in the \nexcited state.The dyes show strongly different kinetics in the excited state. BMC relaxes faster by \nabout 2 orders of magnitude than DODCI and shows a much higher photoisomerization \nrate. In accordance with Eyring's theory the higher relaxation and isomerization rate of \nBMC is connected with an entropy increase in the transition state.","PeriodicalId":296295,"journal":{"name":"Laser Chemistry","volume":"183 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"10","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Laser Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1155/LC.7.261","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 10
Abstract
A streptocyanine dye (BMC) and an oxadicarbocyanine (DODCI) were studied in the
picosecond and millisecond time region. The comparison showed that for both dyes the
following parameters are nearly equal: the radiative lifetime, the difference between the
absorption maxima of the stable form and the photoisomer, the activation energy and
the frequency factor for the thermal backreaction and even the energy barrier in the
excited state.The dyes show strongly different kinetics in the excited state. BMC relaxes faster by
about 2 orders of magnitude than DODCI and shows a much higher photoisomerization
rate. In accordance with Eyring's theory the higher relaxation and isomerization rate of
BMC is connected with an entropy increase in the transition state.
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