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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">zhps-763</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>ФЛУОРЕСЦЕНЦИЯ 5- и 6-КАРБОКСИФЛУОРЕСЦЕИНОВЫХ БИФЛУОРОФОРОВ</article-title><trans-title-group xml:lang="en"><trans-title>FLUORESCENCE OF THE 5- and 6-CARBOXYFLUORESCEIN BIFLUOROPHORES</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Поведайло</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Povedailo</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"><p>Minsk, 220072</p></bio><email xlink:type="simple">poved@ifanbel.bas-net.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тихомиров</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Tikhomirov</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"><p>Minsk, 220072</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Яковлев</surname><given-names>Д. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Yakovlev</surname><given-names>D. L.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"><p>Minsk, 220072</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лысенко</surname><given-names>И. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Lysenko</surname><given-names>I. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Фан</surname><given-names>Ф.</given-names></name><name name-style="western" xml:lang="en"><surname>Fan</surname><given-names>F.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шманай</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Shmanai</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт физики НАН Беларуси</institution></aff><aff xml:lang="en"><institution>B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт физико-органической химии НАН Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Physical and Organic Chemistry of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>29</day><month>01</month><year>2021</year></pub-date><volume>88</volume><issue>1</issue><fpage>41</fpage><lpage>47</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Поведайло В.А., Тихомиров С.А., Яковлев Д.Л., Лысенко И.Л., Фан Ф., Шманай В.В., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Поведайло В.А., Тихомиров С.А., Яковлев Д.Л., Лысенко И.Л., Фан Ф., Шманай В.В.</copyright-holder><copyright-holder xml:lang="en">Povedailo V.A., Tikhomirov S.A., Yakovlev D.L., Lysenko I.L., Fan F., Shmanai V.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://zhps.ejournal.by/jour/article/view/763">https://zhps.ejournal.by/jour/article/view/763</self-uri><abstract><p>Синтезированы бифлуорофоры (5-FAM)2 и (6-FAM)2 на каркасе 3,5-диаминобензойной кислоты, позволяющем вставлять две молекулы флуорофора в один сайт. Несмотря на сходство структур изомеров 5- и 6-карбоксифлуоресцеинов (5-FAM и 6-FAM), фотофизическое поведение соответствующих бифлуорофоров различается. Квантовый выход люминесценции (6-FAM)2 в буферном растворе с рН 8.5 в 2.4 раза ниже, чем для (5-FAM)2. При увеличении вязкости раствора в случае использования водно-глицериновой смеси и при изменении микровязкости в случае мицелярного раствора замедляется структурная релаксация молекул в возбужденном состоянии, что приводит к увеличению интенсивности флуоресценции, времени жизни возбужденных состояний и степени поляризации, т. е. фотофизические свойства синтезированных соединений в значительной степени контролируются вязкостью среды.</p></abstract><trans-abstract xml:lang="en"><p>Bifluorophores (5-FAM)2 and (6-FAM)2 were synthesized on a 3,5-diaminobenzoic acid framework which allows two fluorophore molecules to be inserted into a single site. Despite the similarity of the structures of the 5- and 6-carboxyfluorescein isomers (5-FАM and 6-FAM), the photo-physical behavior of the corresponding bifluorophores differs. The luminescence quantum yield of (6-FAM)2 in a buffer solution with pH 8.5 is 2.4 times lower than for (5-FAM)2. It is shown that structural relaxation of molecules in the excited state slows down as a result of the solution viscosity increasing in the case of using a water-glycerol mixture and the increasing in the microviscosity in the case of micellar solution. This slowing down leads to an increase of the fluorescence intensity, lifetime of excited states and the degree of polarization, i.e. the photophysical properties of the synthesized compounds largely controlled by the viscosity of the medium.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>интенсивность флуоресценции</kwd><kwd>время жизни флуоресценции</kwd><kwd>карбоксифлуоресцеин</kwd><kwd>флуоресцентные биомолекулы</kwd><kwd>клик-химия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>fluorescence intensity</kwd><kwd>fluorescence lifetime</kwd><kwd>carboxyfluorescein</kwd><kwd>fluorescent biomolecules</kwd><kwd>click chemistry</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке Белорусского республиканского фонда фундаментальных исследований (проект № Ф20В-003).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">X.-F. 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