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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2220-8054-2021-12-2-167-174</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-355</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="en"><subject>NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>НАНОСИСТЕМЫ: ФИЗИКА, ХИМИЯ, МАТЕМАТИКА</subject></subj-group></article-categories><title-group><article-title>A quantum chemical study on the magnetic nanocarrier-tirapazamine drug delivery system</article-title><trans-title-group xml:lang="ru"><trans-title>Квантово-химическое исследование системы доставки лекарств магнитный наноноситель-тирапазамин</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>Avarand</surname><given-names>S.</given-names></name><name name-style="western" xml:lang="en"><surname>Avarand</surname><given-names>S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Department of Chemistry, Mashhad Branch</p><p>Mashhad</p></bio><bio xml:lang="en"><p>Department of Chemistry, Mashhad Branch</p><p>Mashhad</p></bio><email xlink:type="simple">sadaf.avarand@gmail.com</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>Morsali</surname><given-names>A.</given-names></name><name name-style="western" xml:lang="en"><surname>Morsali</surname><given-names>A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Department of Chemistry, Mashhad Branch</p><p>Mashhad</p></bio><bio xml:lang="en"><p>Department of Chemistry, Mashhad Branch</p><p>Mashhad</p></bio><email xlink:type="simple">almorsali@yahoo.com</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>Heravi</surname><given-names>M. M.</given-names></name><name name-style="western" xml:lang="en"><surname>Heravi</surname><given-names>M. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Department of Chemistry, Mashhad Branch</p><p>Mashhad</p></bio><bio xml:lang="en"><p>Department of Chemistry, Mashhad Branch</p><p>Mashhad</p></bio><email xlink:type="simple">drmh45@yahoo.com</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>Beyramabadi</surname><given-names>S. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Beyramabadi</surname><given-names>S. А.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Department of Chemistry, Mashhad Branch</p><p>Mashhad</p></bio><bio xml:lang="en"><p>Department of Chemistry, Mashhad Branch</p><p>Mashhad</p></bio><email xlink:type="simple">abeyramabadi@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Mashhad Branch, Islamic Azad University</institution></aff><aff xml:lang="en"><institution>Mashhad Branch, Islamic Azad University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>28</day><month>07</month><year>2025</year></pub-date><volume>12</volume><issue>2</issue><fpage>167</fpage><lpage>175</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Avarand S., Morsali A., Heravi M.M., Beyramabadi S.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Avarand S., Morsali A., Heravi M.M., Beyramabadi S.А.</copyright-holder><copyright-holder xml:lang="en">Avarand S., Morsali A., Heravi M.M., Beyramabadi S.А.</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://nanojournal.ifmo.ru/jour/article/view/355">https://nanojournal.ifmo.ru/jour/article/view/355</self-uri><abstract><p>Magnetic nanoparticles are among the most important carriers for the delivery of anticancer drugs. Four important noncovalent interactions between tirapazamine anticancer drug (TPZ) and magnetic nanoparticle Fe6(OH)18(H2O)6 (MNP) have been examined by using density functional theory (DFT). Important interactions are those where the drug approaches the magnetic nanocarrier via NH2 (MNP/TPZ1), NO (MNP/TPZ2-3) and intraring N-atom (MNP/TP4) functional groups. The negative values of binding energies and quantum molecular descriptor showed that these interactions contribute to the stability of the system. By increasing the temperature, TPZ can bond to MNP through NH2 (NH2 mechanism), NO (NO mechanisms) and intraring N-atom (N mechanism) functional groups. The activation parameters of four mechanisms were evaluated using quadratic synchronous transit method. Relative energies indicate that the product of the NH2 mechanism is more stable but is produced more slowly (thermodynamic product). In contrast, the products of the NO mechanisms are kinetic products.</p></abstract><trans-abstract xml:lang="ru"><p>Магнитные наночастицы являются одними из наиболее важных носителей для доставки противоопухолевых препаратов. Четыре важных нековалентных взаимодействия между противоопухолевым препаратом тирапазамином (TPZ) и магнитными наночастицами Fe6(OH)18(H2O)6 (MNP) были исследованы с использованием теории функционала плотности (DFT). Важными взаимодействиями являются те, в которых лекарство приближается к магнитному наноносителю через функциональные группы NH2 (MNP/TPZ1), NO (MNP/TPZ2-3) и внутрикольцевого атома азота (MNP/TP4). Отрицательные значения энергий связи и квантового молекулярного дескриптора показали, что эти взаимодействия способствуют стабильности системы. При повышении температуры TPZ может связываться с MNP через функциональные группы NH2 (механизм NH2), NO (механизм NO) и атома азота внутри кольца (механизм N). Параметры активации четырех механизмов оценивались методом квадратичного синхронного транзита. Относительные энергии показывают, что продукт механизма NH2 более стабилен, но образуется медленнее (термодинамический продукт). Напротив, продукты механизмов NO являются кинетическими продуктами.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>магнитные наночастицы</kwd><kwd>тирапазамин</kwd><kwd>DFT</kwd><kwd>нековалентные взаимодействия</kwd><kwd>механизм реакции</kwd></kwd-group><kwd-group xml:lang="en"><kwd>magnetic nanoparticles</kwd><kwd>tirapazamine</kwd><kwd>DFT</kwd><kwd>noncovalent interactions</kwd><kwd>reaction mechanism</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">Lu A.H., Salabas E.e.L., Schuth F. Magnetic nanoparticles: synthesis, protection, functionalization, and application. ¨ Angew. Chem. Int. 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