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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 Physical Chemistry A</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Physical Chemistry A</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал физической химии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-4537</issn><issn publication-format="electronic">3034-5537</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">700482</article-id><article-id pub-id-type="doi">10.7868/S3034553725090075</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>PHYSICAL CHEMISTRY OF SOLUTIONS</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ФИЗИЧЕСКАЯ ХИМИЯ РАСТВОРОВ</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">MIXED LIGAND COMPLEX CONSTRUCTION OF NICKEL(II) AND ZINC CATIONS WITH HISTIDINE, LYSINE AND ARGININE IN AQUEOUS SOLUTION</article-title><trans-title-group xml:lang="ru"><trans-title>СМЕШАННОЛИГАНДНОЕ КОМПЛЕКСООБРАЗОВАНИЕ КАТИОНОВ НИКЕЛЯ(II) И ЦИНКА С ГИСТИДИНОМ, ЛИЗИНОМ И АРГИНИНОМ В ВОДНОМ РАСТВОРЕ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Karaseva</surname><given-names>Ya. E</given-names></name><name xml:lang="ru"><surname>Карасева</surname><given-names>Я. Е</given-names></name></name-alternatives><email>karasevaaroslavna255@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Pyreu</surname><given-names>D. F</given-names></name><name xml:lang="ru"><surname>Пырэу</surname><given-names>Д. Ф</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Ivanovo State University</institution></aff><aff><institution xml:lang="ru">Ивановский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-09-15" publication-format="electronic"><day>15</day><month>09</month><year>2025</year></pub-date><volume>99</volume><issue>9</issue><issue-title xml:lang="en">VOL 99, NO9 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 99, №9 (2025)</issue-title><fpage>1344</fpage><lpage>1351</lpage><history><date date-type="received" iso-8601-date="2026-01-08"><day>08</day><month>01</month><year>2026</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://journals.eco-vector.com/0044-4537/article/view/700482">https://journals.eco-vector.com/0044-4537/article/view/700482</self-uri><abstract xml:lang="en"><p>The formation of mixed-ligand complexes of different composition in the systems M(II) – L-histidine (His) – L (M = Ni, Zn; L = L-lysine (Lys), L-arginine (Arg)) has been studied by pH-metry and spectrophotometry methods and their formation constants have been calculated at 298.15 K and ionic strength <italic>I</italic> = 0.5 mol/L (KNO<sub>3</sub>). Based on the comparative analysis of the coproportioning reaction constants, the dentativity of the ligands was evaluated and the most probable way of coordination of amino acid residues in the mixed complexes was proposed.</p></abstract><trans-abstract xml:lang="ru"><p>Методами pH-метрии и спектрофотометрии изучено образование смешаннолигандных комплексов различного состава в системах M(II) – L-гистидин (His) – L (M = Ni, Zn; L = L-лизин (Lys), L-аргинин (Arg)) и рассчитаны их константы образования при 298.15 K и ионной силе <italic>I</italic> = 0.5 моль/л (KNO<sub>3</sub>). На основании проведенного сравнительного анализа констант реакций сопропорционирования дана оценка дентатности лигандов и предложен наиболее вероятный способ координации аминокислотных остатков в составе смешанных комплексов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>mixed-ligand complexation</kwd><kwd>histidine</kwd><kwd>lysine</kwd><kwd>arginine</kwd><kwd>nickel</kwd><kwd>zinc</kwd><kwd>dentativity</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>смешаннолигандное комплексообразование</kwd><kwd>гистидин</kwd><kwd>лизин</kwd><kwd>аргинин</kwd><kwd>никель</kwd><kwd>цинк</kwd><kwd>дентатность</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Yamauchi O., Odani A. // J. Chem. Soc., Dalton Trans. 2002. P. 3411. https://doi.org/10.1039/B202385G</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Yamauchi O., Odani A. // Inorg. Chim. Acta. 1985. V. 100. 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