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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Doklady Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Doklady Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Российской академии наук. Химия, науки о материалах</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2686-9535</issn><issn publication-format="electronic">3034-5111</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">695877</article-id><article-id pub-id-type="doi">10.31857/S2686953525030021</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>CHEMISTRY</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ХИМИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Features of the Structure of 2,5-Dimercapto-1,3,4-Thiadiazole</article-title><trans-title-group xml:lang="ru"><trans-title>Особенности структуры 2,5-димеркапто-1,3,4-тиадиазола</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Aleinikova</surname><given-names>T. P.</given-names></name><name xml:lang="ru"><surname>Алейникова</surname><given-names>Т. П.</given-names></name></name-alternatives><email>aleynikova_tp@vstu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Orlyanskii</surname><given-names>V. M.</given-names></name><name xml:lang="ru"><surname>Орлянский</surname><given-names>В. М.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Arisova</surname><given-names>V. N.</given-names></name><name xml:lang="ru"><surname>Арисова</surname><given-names>В. Н.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Navrotskii</surname><given-names>V. A.</given-names></name><name xml:lang="ru"><surname>Навроцкий</surname><given-names>В. А.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Novakov</surname><given-names>I. A.</given-names></name><name xml:lang="ru"><surname>Новаков</surname><given-names>И. А.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Volgograd State Technical University</institution></aff><aff><institution xml:lang="ru">Волгоградский государственный технический университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Scientific and production enterprise "KF"</institution></aff><aff><institution xml:lang="ru">Научно-производственное предприятие “КФ”</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-07-15" publication-format="electronic"><day>15</day><month>07</month><year>2025</year></pub-date><volume>522</volume><issue>1</issue><issue-title xml:lang="en">VOL 522, NO (2025)</issue-title><issue-title xml:lang="ru">ТОМ 522, № (2025)</issue-title><fpage>14</fpage><lpage>18</lpage><history><date date-type="received" iso-8601-date="2025-11-06"><day>06</day><month>11</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-07-15"/></permissions><self-uri xlink:href="https://journals.eco-vector.com/2686-9535/article/view/695877">https://journals.eco-vector.com/2686-9535/article/view/695877</self-uri><abstract xml:lang="en"><p>For the first time, using quantum chemical analysis, the structure of 2,5-dimercapto-1,3,4-thiadiazole was proposed, which is described by a single formula in the form of three putative isomers, which is a crystalline tribasic RS–H Brensted acid formed solely by hydrogen bonds involving four nitrogen atoms and three sulfur atoms, which is confirmed by X-ray diffraction analysis and FTIR spectra. These structural features must be considered in the production technology of the target product.</p></abstract><trans-abstract xml:lang="ru"><p>Впервые с использованием квантовохимического моделирования предложена структура 2,5-димеркапто-1,3,4-тиадиазола (ДМТД), которая описывается в виде ассоциата трех предполагаемых изомеров. Ассоциат представляет собой трехосновную RS–H-кислоту Бренстеда и образован исключительно за счет водородных связей с участием четырех атомов азота и трех атомов серы. Предложенная структура ассоциата ДМТД подтверждена методами рентгеновской порошковой дифрактометрии и ИК-спектроскопии.</p></trans-abstract><kwd-group xml:lang="en"><kwd>2,5-dimercapto-1,3,4-thiadiazole</kwd><kwd>associate</kwd><kwd>RS-H Brensted acid</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>2,5-димеркапто-1,3,4-тиадиазол</kwd><kwd>ассоциат</kwd><kwd>RSH-кислота Бренстеда</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Busch M. // Chem. Ber. V. 27. 1894. P. 2518.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Налетова А.В., Давыдов Д.В., Бакунин В.Н. // Химия и технология топлив и масел. 2021. № 5. С. 45–52. https://doi.org/32935/0023-1169-2021-626-5-45-52</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Basir N.F.A., Ghafarikhaligh M., Johan M.R., Khaligh N.G. // J. Therm. Anal. Calorim. 2024. V. 149. 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