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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">chemicallytech</journal-id><journal-title-group><journal-title xml:lang="en">Fine Chemical Technologies</journal-title><trans-title-group xml:lang="ru"><trans-title>Тонкие химические технологии</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2410-6593</issn><issn pub-type="epub">2686-7575</issn><publisher><publisher-name>MIREA – Russian Technological University (RTU MIREA).</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32362/2410-6593-2021-16-4-352-362</article-id><article-id custom-type="elpub" pub-id-type="custom">chemicallytech-1728</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>CHEMISTRY AND TECHNOLOGY OF INORGANIC MATERIALS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ХИМИЯ И ТЕХНОЛОГИЯ НЕОРГАНИЧЕСКИХ МАТЕРИАЛОВ</subject></subj-group></article-categories><title-group><article-title>A novel сalcium trifluoroacetate structure</article-title><trans-title-group xml:lang="ru"><trans-title>Трифторацетат кальция: новый структурный тип</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-4694-2602</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Васильева</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Vasilyeva</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Васильева Александра Андреевна, студентка</p><p>119991, Москва, ГСП-1, Ленинские горы, д. 1, стр. 3</p></bio><bio xml:lang="en"><p>Alexandra A. Vasilyeva, Student</p><p>1-3, Leninskie Gory, GSP-1, Moscow, 119991</p></bio><email xlink:type="simple">6490351@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7874-4179</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Глазунова</surname><given-names>Т. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Glazunova</surname><given-names>T. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Глазунова Татьяна Юрьевна, старший преподаватель кафедры неорганической химии</p><p>119991, Москва, ГСП-1, Ленинские горы, д. 1, стр. 3</p></bio><bio xml:lang="en"><p>Tatyana Yu. Glazunova, Senior Lecturer, Department of Inorganic Chemistry</p><p>1-3, Leninskie Gory, GSP-1, Moscow, 119991</p></bio><email xlink:type="simple">ctpayc@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8972-3325</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Терещенко</surname><given-names>Д. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Tereshchenko</surname><given-names>D. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Терещенко Денис Сергеевич, младший научный сотрудник</p><p>119991, Москва, ГСП-1, Ленинские горы, д. 1, стр. 3</p></bio><bio xml:lang="en"><p>Denis S. Tereshchenko, Research Assistant</p><p>1-3, Leninskie Gory, GSP-1, Moscow, 119991</p></bio><email xlink:type="simple">tereschenko_den@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2579-7960</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лермонтова</surname><given-names>Э. Х.</given-names></name><name name-style="western" xml:lang="en"><surname>Lermontova</surname><given-names>E. Kh.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лермонтова Эльмира Харисовна, научный сотрудник</p><p>119991, Москва, Ленинский пр-т, 31</p></bio><bio xml:lang="en"><p>Elmira Kh. Lermontova, Researcher</p><p>31, Leninskii pr., Moscow, 119071</p></bio><email xlink:type="simple">Elmira.ler@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Химический факультет, Московский государственный университет им. М.В. Ломоносова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Faculty of Chemistry, Lomonosov Moscow State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт общей и неорганической химии им. Н.С. Курнакова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>N.S. Kurnakov Institute of General and Inorganic Chemistry</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>28</day><month>09</month><year>2021</year></pub-date><volume>16</volume><issue>4</issue><fpage>352</fpage><lpage>362</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Vasilyeva A.A., Glazunova T.Y., Tereshchenko D.S., Lermontova E.K., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Васильева А.А., Глазунова Т.Ю., Терещенко Д.С., Лермонтова Э.Х.</copyright-holder><copyright-holder xml:lang="en">Vasilyeva A.A., Glazunova T.Y., Tereshchenko D.S., Lermontova E.K.</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://www.finechem-mirea.ru/jour/article/view/1728">https://www.finechem-mirea.ru/jour/article/view/1728</self-uri><abstract><p>Objectives. The study was devoted to considering the features of the synthesis and crystal structure of calcium trifluoroacetate Ca2(CF3COO)4·8CF3COOH and investigating the products of its thermal behavior.Methods. The compositions of the proposed structural form were characterized by various physicochemical methods (X-ray diffraction, IR spectroscopy), and the products of thermal decomposition were determined under dynamic vacuum conditions.Results. The reaction between calcium carbonate and 99% trifluoroacetic acid yielded a new structural type of calcium trifluoroacetate Ca2(CF3COO)4·8CF3COOH (I) in the form of colorless prismatic crystals unstable air. X-ray diffraction results confirmed the composition I: space group P21, with unit cell parameters: a = 10.0193(5) Å, b = 15.2612(7) Å, c = 16.3342(8) Å, β = 106.106(2)°, V = 2399.6(2) Å3, Z = 2. The structure is molecular, constructed from Ca2(CF3COO)4·8CF3COOH dimers. The end molecules of the trifluoroacetic acid were involved in the formation of intramolecular hydrogen bonds with oxygen atoms of the bidentate bridging anions CF3COO−. There were strongly pronouncedsymmetric and asymmetric absorption bands of COO and CF3-groups in the IR spectrum of the resulting compound in the range of 1200–1800 cm−1. The definite peak of the oscillation of the OH-group at 3683 cm−1 corresponds to the trifluoroacetic acid molecules present in the structure. The broadpeak of the valence oscillations in the range of 3300–3500 cm−1 is caused by the presence of intramolecular hydrogen bonds. Decomposition began at 250°C and 10−2 mm Hg with calcium fluoride CaF2 as the final decomposition product.Conclusions. We obtained a previously undescribed calcium–trifluoroacetic acid complex whose composition can be represented by Ca2(CF3COO)4·8CF3COOH. The crystal island structure is a dimeric molecule where the calcium atoms are bound into dimers by four trifluoroacetate groups. The complex was deposited in the Cambridge Structural Data Bank with a deposit number CCDC 2081186. Although the compound has a molecular structure, thermal decomposition leads to the formation of calcium fluoride characterized by a small particle size, which may further determine its applications.</p></abstract><trans-abstract xml:lang="ru"><p>Цели. Работа посвящена рассмотрению особенностей синтеза и кристаллического строения трифторацетата кальция Ca2(CF3COO)4·8CF3COOH, а также изучению продуктов его термического поведения.Методы. Соединение охарактеризовано различными физико-химическими методами (рентгеноструктурный анализ, ИК-спектроскопия), установлены продукты термического разложения в условиях динамического вакуума.Результаты. Взаимодействием карбоната кальция с 99% трифторуксусной кислотой синтезирован новый структурный тип трифторацетата кальция Ca2(CF3COO)4·8CF3COOH (I) в виде неустойчивых на воздухе бесцветных призматических кристаллов. Строение I установлено по результатам рентгеноструктурного анализа: пространственная группа Р21, параметры элементарной ячейки: a = 10.0193(5) Å, b = 15.2612(7) Å, c = 16.3342(8) Å, β = 106.106(2)°, V = 2399.6(2) Å3, Z = 2. Структура молекулярная, построена из димеров Ca2(CF3COO)4·8CF3COOH. Торцевые молекулы трифторуксусной кислоты участвуют в образовании внутримолекулярных водородных связей с атомами кислорода бидентатных мостиковых анионов CF3COO−. На ИК-спектре полученного соединения в диапазоне 1200–1800 см−1 присутствуют ярко выраженные симметричные и асимметричные полосы поглощения СОО и CF3-групп. Четкий пик колебания OH-группы на 3683 см−1 соответствует присутствующим в структуре молекулам трифторуксусной кислоты. Широкий пик валентных колебаний в области 3300–3500 см−1 обусловлен наличием внутримолекулярных водородных связей. При давлении 10−2 мм рт.ст. разложение начинается при 250 °С, конечным продуктом разложения является фторид кальция CaF2.Выводы. Нами получен ранее не описанный комплекс кальция с трифторуксусной кислотой, состав которого может быть представлен формулой Ca2(CF3COO)4·8CF3COOH, кристаллическая островная структура которого представляет собой димерную молекулу, а атомы кальция связаны в димеры четырьмя трифторацетатными группами. Комплекс задепонирован в Кембриджском банке структурных данных, номер депонирования – CCDC 2081186. Соединение имеет молекулярное строение, термическое разложение приводит к образованию фторида кальция, характеризующегося небольшим размером частиц, что может в дальнейшем обусловить его применение.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>трифторацетатные комплексы</kwd><kwd>щелочноземельные металлы</kwd><kwd>кристаллическая структура</kwd><kwd>ИК-спектроскопия</kwd><kwd>термические свойства</kwd><kwd>фторид кальция</kwd></kwd-group><kwd-group xml:lang="en"><kwd>trifluoroacetate complexes</kwd><kwd>alkaline earth metals</kwd><kwd>crystal structure</kwd><kwd>IR spectroscopy</kwd><kwd>thermal properties</kwd><kwd>calcium fluoride</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке гранта Российского Фонда Фундаментальных Исследований № 19-03-01059. Рентгеноструктурный анализ выполнен на оборудовании Центра коллективного пользования Института общей и неорганической химии им. Н.С. Курнакова Российской академии наук (ИОНХ РАН) в рамках государственного задания ИОНХ РАН в области фундаментальных научных исследований.</funding-statement><funding-statement xml:lang="en">The study was supported by the Russian Foundation for Basic Research, grant No. 19-03-01059. X-ray diffraction studies were performed at the User Facilities Center of the Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, within the State Assignment on Fundamental Research for the Kurnakov Institute of General and Inorganic Chemistry.</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">Milne J.B., Parker T.J. Dissociation constant of aqueous trifluoroacetic acid by cryoscopy and conductivity. J. Solution Chem. 1981;10(7):479–487. https://doi.org/10.1007/BF00652082</mixed-citation><mixed-citation xml:lang="en">Milne J.B., Parker T.J. 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