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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">Russian Journal of Inorganic Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Inorganic Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал неорганической химии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-457X</issn><issn publication-format="electronic">3034-560X</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">690764</article-id><article-id pub-id-type="doi">10.31857/S0044457X25080038</article-id><article-id pub-id-type="edn">jiyigb</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>СИНТЕЗ И СВОЙСТВА НЕОРГАНИЧЕСКИХ СОЕДИНЕНИЙ</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">HYDROTHERMAL SYNTHESIS OF K<sub>2</sub>CE(PO<sub>4</sub>)<sub>2 </sub>· ХH<sub>2</sub>O AND ANALYSIS OF ITS PHOTOPROTECTIVE PROPERTIES</article-title><trans-title-group xml:lang="ru"><trans-title>Гидротермальный синтез K2Ce(PO4)2 ∙ xH2O и анализ его фотопротекторных свойств</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kozlova</surname><given-names>T. O.</given-names></name><name xml:lang="ru"><surname>Козлова</surname><given-names>Т. О.</given-names></name></name-alternatives><email>taisiya@igic.ras.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Vasilyeva</surname><given-names>D. N.</given-names></name><name xml:lang="ru"><surname>Васильева</surname><given-names>Д. Н.</given-names></name></name-alternatives><email>taisiya@igic.ras.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Savintseva</surname><given-names>I. V.</given-names></name><name xml:lang="ru"><surname>Савинцева</surname><given-names>И. В.</given-names></name></name-alternatives><email>taisiya@igic.ras.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Popov</surname><given-names>A. L.</given-names></name><name xml:lang="ru"><surname>Попов</surname><given-names>А. Л.</given-names></name></name-alternatives><email>taisiya@igic.ras.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Simonenko</surname><given-names>N. P.</given-names></name><name xml:lang="ru"><surname>Симоненко</surname><given-names>Н. П.</given-names></name></name-alternatives><email>taisiya@igic.ras.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kozlov</surname><given-names>D. A.</given-names></name><name xml:lang="ru"><surname>Козлов</surname><given-names>Д. А.</given-names></name></name-alternatives><email>taisiya@igic.ras.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт общей и неорганической химии им. Н.С. Курнакова РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">National Research University Higher School of Economics</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский университет “Высшая школа экономики”</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Institute of Theoretical and Experimental Biophysics of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт теоретической и экспериментальной биофизики РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-08-15" publication-format="electronic"><day>15</day><month>08</month><year>2025</year></pub-date><volume>70</volume><issue>8</issue><issue-title xml:lang="en">VOL 70, NO8 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 70, №8 (2025)</issue-title><fpage>1004</fpage><lpage>1013</lpage><history><date date-type="received" iso-8601-date="2025-09-21"><day>21</day><month>09</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></permissions><self-uri xlink:href="https://transsyst.ru/0044-457X/article/view/690764">https://transsyst.ru/0044-457X/article/view/690764</self-uri><abstract xml:lang="en"><p>A new method for obtaining K<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2 </sub>∙ xH<sub>2</sub>O (s. g. I4<sub>1</sub>/amd, a = b = 6.8300(2), c = 17.8488(4) Å, V = 832.63(4) Å<sup>3</sup>, Z = 4) under hydrothermal conditions has been developed. It has been established that the thermolysis of this compound proceeds through three stages of mass loss with the formation of CePO<sub>4</sub> и K<sub>4</sub>P<sub>2</sub>O<sub>7</sub> as intermediate products, which upon further heating form a mixture of CePO<sub>4</sub> and K<sub>3</sub>Ce(PO<sub>4</sub>)<sub>2</sub>. The calculated values of the sun protection factor and UVA protection factor for K<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2 </sub>∙ xH<sub>2</sub>O were 2.1 and 2.0, respectively. In relation to the human keratinocyte cell line (HaCaT), a photoprotective effect of K<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2 </sub>∙ xH<sub>2</sub>O was recorded. For the first time, the photoactive properties of KCe<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> and K<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2 </sub>∙ хH<sub>2</sub>O in the decomposition reaction of methylene blue were evaluated. A significant slowdown in the decomposition reaction of an organic dye was demonstrated when using K<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2 </sub>∙ хH<sub>2</sub>O.</p></abstract><trans-abstract xml:lang="ru"><p>Разработан новый метод получения K<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2 </sub>∙ xH<sub>2</sub>O (пр. гр. I4<sub>1</sub>/amd, a = b = 6.8300(2), c = 17.8488(4) Å, V = 832.63(4) Å<sup>3</sup>, Z = 4) в гидротермальных условиях. Установлено, что термолиз этого соединения протекает через три стадии потери массы с формированием в качестве промежуточных продуктов CePO<sub>4</sub> и K<sub>4</sub>P<sub>2</sub>O<sub>7</sub>, которые при дальнейшем нагреве образуют смесь CePO<sub>4</sub> и K<sub>3</sub>Ce(PO<sub>4</sub>)<sub>2</sub>. Рассчитанные значения солнцезащитного фактора и фактора защиты от УФ-А излучения для K<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2 </sub>∙ xH<sub>2</sub>O составили 2.1 и 2.0 соответственно. По отношению к клеточной линии кератиноцитов человека (HaCaT) зафиксировано фотопротекторное действие K<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2 </sub>∙ xH<sub>2</sub>O. Впервые оценены фотоактивные свойства KCe<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> и K<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2 </sub>∙ хH<sub>2</sub>O в реакции разложения метиленового синего. Продемонстрировано значительное замедление реакции разложения органического красителя при использовании K<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2</sub> ∙ хH<sub>2</sub>O.</p></trans-abstract><kwd-group xml:lang="en"><kwd>cerium(IV</kwd><kwd>phosphates</kwd><kwd>structure</kwd><kwd>thermolysis</kwd><kwd>UV protection</kwd><kwd>sun protection factor (SPF)</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>фосфаты церия(IV)</kwd><kwd>структура</kwd><kwd>термолиз</kwd><kwd>защита от УФ-излучения</kwd><kwd>солнцезащитный фактор (SPF)</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Serpone N. // Photochem. Photobiol. Sci. 2021. V. 20. № 2. P. 189. https://doi.org/10.1007/s43630-021-00013-1</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Pols J.C., Williams G.M., Pandeya N. et al. // Cancer Epidemiol. Biomarkers Prev. 2006. V. 15. № 12. 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