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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-856</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>Расчет и сравнительный анализ ик-спектров ряда брассинолидов с различной структурой их боковой цепи</article-title><trans-title-group xml:lang="en"><trans-title>Calculation and comparative analysis of ir spectra of a number of brassinolides with different structure of their side chain</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>Андрианов</surname><given-names>В. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Andrianov</surname><given-names>V. M.</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-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Королевич</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Korolevich</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">korolevi@dragon.bas-net.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный аграрный технический университет</institution></aff><aff xml:lang="en"><institution>Belarusian State Agrarian Technical University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>22</day><month>07</month><year>2021</year></pub-date><volume>88</volume><issue>4</issue><fpage>513</fpage><lpage>520</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Андрианов В.М., Королевич М.В., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Андрианов В.М., Королевич М.В.</copyright-holder><copyright-holder xml:lang="en">Andrianov V.M., Korolevich M.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/856">https://zhps.ejournal.by/jour/article/view/856</self-uri><abstract><p>Для установления спектрально-структурных корреляций практически важных биологически активных стероидных фитогормонов — молекул (22S,23S)-24-эпибрассинолида, (22S,23S)-28-гомобрассинолида и гомобрассинолида — проведен сравнительный анализ экспериментальных ИК-спектров и теоретических спектральных кривых поглощения этих близких по химическому строению молекул. Дана оценка влияния структурных особенностей в пределах боковой цепи исследуемых молекул на формирование ИК-спектров и найдена связь между структурными различиями и наблюдаемыми изменениями ИК-спектров в области 1500—950 см–1</p></abstract><trans-abstract xml:lang="en"><p>To establish spectro-structural correlations of practically important biologically active steroid phytohormones, namely, molecules (22S,23S)-24-epibrassinolide, (22S,23S)-28-homobrassinolide and homobrassinolide, a comparative analysis of experimental IR spectra and theoretical spectral absorption curves of these molecules with similar chemical structure has been done. This made it possible to evaluate the influence of structural features within the side chain of the studied molecules on the formation of IR spectra and to establish a connection between their structural differences and the observed changes in IR spectra in the range of 1500–950 cm–1 . </p></trans-abstract><kwd-group xml:lang="ru"><kwd>ИК-спектроскопия</kwd><kwd>анализ нормальных колебаний</kwd><kwd>абсолютная интенсивность</kwd><kwd>характеристическая частота</kwd><kwd>интерпретация ИК-спектра</kwd><kwd>брассиностероиды</kwd><kwd>брассинолиды</kwd></kwd-group><kwd-group xml:lang="en"><kwd>IR spectroscopy</kwd><kwd>normal vibration analysis</kwd><kwd>absolute IR intensities</kwd><kwd>characteristic frequencies</kwd><kwd>interpretation of IR spectrum</kwd><kwd>brassinosteroids</kwd><kwd>brassinolides</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Y. Zhou, C. 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