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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 General Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of General Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал общей химии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-460X</issn><issn publication-format="electronic">3034-5596</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">667115</article-id><article-id pub-id-type="doi">10.31857/S0044460X23020191</article-id><article-id pub-id-type="edn">QDADCY</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</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">Electronic State of Arsenic <italic>endo</italic>-atom and indices of interatomic bonds in[As@Ni<sub>12</sub>As<sub>20</sub>]<sup>3-/0</sup>, As<sub>20</sub>, Ni<sub>12</sub>As<sub>20</sub>, As@C<sub>60</sub>, and As@C<sub>70</sub> Clusters</article-title><trans-title-group xml:lang="ru"><trans-title>Электронное состояние <italic>эндо</italic>-атома мышьяка и индексы межатомных связей в кластерах [As@Ni<sub>12</sub>As<sub>20</sub>]<sup>3-/0</sup>, As<sub>20</sub>, Ni<sub>12</sub>As<sub>20</sub>, As@C<sub>60</sub> и As@C<sub>7<sub>0 </sub></sub></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Semenov</surname><given-names>S. G</given-names></name><name xml:lang="ru"><surname>Семенов</surname><given-names>С. Г</given-names></name></name-alternatives><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bedrina</surname><given-names>M. E</given-names></name><name xml:lang="ru"><surname>Бедрина</surname><given-names>М. Е</given-names></name></name-alternatives><email>m.bedrina@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Klemeshev</surname><given-names>V. A</given-names></name><name xml:lang="ru"><surname>Клемешев</surname><given-names>В. А</given-names></name></name-alternatives><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">B.P. Konstantinov Petersburg Institute of Nuclear Physics, National Research Center “Kurchatov Institute”</institution></aff><aff><institution xml:lang="ru">Петербургский институт ядерной физики имени Б. П. Константинова Национального исследовательского центра «Курчатовский институт»</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">St. Petersburg State University</institution></aff><aff><institution xml:lang="ru">Санкт-Петербургский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-02-15" publication-format="electronic"><day>15</day><month>02</month><year>2023</year></pub-date><volume>93</volume><issue>2</issue><issue-title xml:lang="en">NO2 (2023)</issue-title><issue-title xml:lang="ru">№2 (2023)</issue-title><fpage>322</fpage><lpage>328</lpage><history><date date-type="received" iso-8601-date="2025-02-26"><day>26</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Российская академия наук</copyright-statement><copyright-year>2023</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/0044-460X/article/view/667115">https://transsyst.ru/0044-460X/article/view/667115</self-uri><abstract xml:lang="en"><p>The DFT PBE0/SDD method was used to calculate bond lengths and bond indices in As<sub>20</sub>, Ni<sub>12</sub>As<sub>20</sub>, [As@Ni<sub>12</sub>As<sub>20</sub>]<sup>3-</sup>, As@C<sub>60 </sub>and As@C<sub>70 </sub>clusters. The degrees of oxidation and reduction of the endo -atom and the shell are expressed in terms of the populations of one-electron states localized in these components of the complexes. Each As atom in clusters has a entirely localized lone electron pair. The arsenic atom inside fullerenes retains the electronic configuration and spin of the ground state of the free As atom. Inside the [Ni<sub>12</sub>As<sub>20</sub>]<sup>6- </sup>shell, it has an oxidation state of 3+. There is no covalent bond between the endo -atom and the shell in clusters. The bond indices refute the opinion about the “onion” structure of [As@Ni<sub>12</sub>@As<sub>20</sub>]<sup>3-</sup>: the nickel atoms are not bonded to each other, the As-As bond indices are three times lower than in As<sub>20</sub>.</p></abstract><trans-abstract xml:lang="ru"><p>Методом DFT PBE0/SDD вычислены длины и индексы связей в кластерах As<sub>20</sub>, Ni<sub>12</sub>As<sub>20</sub>, [As@Ni<sub>12</sub>As<sub>20</sub>]<sup>3<sup>- </sup></sup>, As@C<sub>60 </sub>и As@C<sub>70</sub>. Степени окисления и восстановления эндо -атома и оболочки выражены через заселенности одноэлектронных состояний, локализованных в этих компонентах комплексов. Каждый атом As в кластерах обладает совершенно локализованной неподеленной электронной парой. эндо -Атом мышьяка внутри фуллеренов сохраняет электронную конфигурацию и спин основного состояния свободного атома As. Внутри оболочки [Ni<sub>12</sub>As<sub>20</sub>]<sup>6- </sup>он имеет степень окисления 3+. Ковалентной связи эндо -атома с оболочкой в кластерах нет. Индексы связей опровергают мнение о «луковичной» структуре [As@Ni<sub>12</sub>@As<sub>20</sub>]<sup>3-</sup>: атомы никеля не связаны между собой, индексы связей As-As в три раза меньше чем в As<sub>20</sub>.</p></trans-abstract><kwd-group xml:lang="en"><kwd>cluster</kwd><kwd>Endohedral complex</kwd><kwd>structure</kwd><kwd>atomic radius</kwd><kwd>oxidation/reduction number</kwd><kwd>Bond indices</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>кластер</kwd><kwd>эндоэдральный комплекс</kwd><kwd>структура</kwd><kwd>атомный радиус</kwd><kwd>степень окисления/ восстановления</kwd><kwd>индексы связей</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Moses M.J., Fettinger J.C., Eichhorn B.W. // Science. 2003. Vol. 300. N 5620. P. 778. doi 10.1126/science.1082342</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Liu H.-T., Li J.-M. // Chin. Phys. 2005. 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