Effects of Isomorphous Substitution on Photophysical and Magnetic Properties of Complexes [Ln 1- x Dy x (MeDPQ) 2 Cl 3 ] (Ln = Y 3+, Ho 3+, and Er 3+ ) : научное издание
Библиографическое описание:Effects of Isomorphous Substitution on Photophysical and Magnetic Properties of Complexes [Ln 1- x Dy x (MeDPQ) 2 Cl 3 ] (Ln = Y 3+, Ho 3+, and Er 3+ ) : научное издание / Maksim A. Zhernakov, Yuriy G. Denisenko, Ruslan G. Batulin [et al.]. - Текст : непосредственный // Chemistry. - 2025. - Т. 31, № 66. - P. e02070. - ISSN 0947-6539. - ISSN 1521-3765, DOI 10.1002/chem.202502070.
Аннотация:<jats:title>Abstract</jats:title> <jats:p> This work encompasses the study of magnetic, optical, and structural properties of the coordination compounds [Ln(MeDPQ) <jats:sub>2</jats:sub> Cl <jats:sub>3</jats:sub> ] (Ln ─ Ho <jats:sup>3+</jats:sup>, Er <jats:sup>3+</jats:sup>, Dy <jats:sup>3+</jats:sup>, and Y <jats:sup>3+</jats:sup> ; MeDPQ − 2-methyldipyrido-[3,2-f:2′,3′-h]-quinoxaline) and substituted complexes [Ln <jats:sub>1-</jats:sub> <jats:italic> <jats:sub>x</jats:sub> </jats:italic> Dy <jats:italic> <jats:sub>x</jats:sub> </jats:italic> (MeDPQ) <jats:sub>2</jats:sub> Cl <jats:sub>3</jats:sub> ] (Ln = Ho <jats:sup>3+</jats:sup>, Er <jats:sup>3+</jats:sup>, and Y <jats:sup>3+</jats:sup> ) based on them. Magnetic measurements within the range 5–300 K revealed single ion anisotropy in [Dy(MeDPQ) <jats:sub>2</jats:sub> Cl <jats:sub>3</jats:sub> ], with the Curie-Weiss temperature <jats:italic>θ</jats:italic> being −3.69 ± 0.03 K. Complexes of Ho <jats:sup>3+</jats:sup> and Er <jats:sup>3+</jats:sup> exhibited <jats:italic>f</jats:italic> – <jats:italic>f</jats:italic> emission in the visible range, while the latter was also emissive in the NIR. Dilution of the Dy <jats:sup>3+</jats:sup> complex with diamagnetic Y <jats:sup>3+</jats:sup> ions resulted in alterations of magnetic and photophysical properties. The substituted complexes Y <jats:sub>0.5</jats:sub> Dy <jats:sub>0.5</jats:sub> and Y <jats:sub>0.9</jats:sub> Dy <jats:sub>0.1</jats:sub> demonstrated paramagnetic behavior, with <jats:italic>θ</jats:italic> being 3.06 ± 0.12 K and 9.64 ± 0.23 K, respectively. In both cases, the emission decay times of Dy <jats:sup>3+</jats:sup> changed insignificantly, 21.02 ± 0.41 µs and 14.56 ± 0.22 µs, respectively, compared to the value (18.92 ± 0.03 µs) of the individual Dy <jats:sup>3+</jats:sup> complex. Additional ligand-based emission bands were observed in the Ho <jats:sup>3+</jats:sup> and Er <jats:sup>3+</jats:sup> complexes at room temperature and 77 K and in the substituted complexes Ho <jats:sub>0.5</jats:sub> Dy <jats:sub>0.5</jats:sub> and Er <jats:sub>0.5</jats:sub> Dy <jats:sub>0.5</jats:sub> at room temperature, which were assigned to the exciplex states. The thermal stability of [Er <jats:sub>0.5</jats:sub> Dy <jats:sub>0.5</jats:sub> (MeDPQ) <jats:sub>2</jats:sub> Cl <jats:sub>3</jats:sub> ] was determined to be the same as for the individual complexes, starting to oxidize at 410°C. </jats:p>
Держатель оригинала документа:Center for Materials Research (LaMa) Justus-Liebig-University Giessen Heinrich-Buff-Ring 16 35392 Giessen Germany, Department of Analytical Chemistry Certification and Quality Management Institute of Petroleum Chemistry and Nanotechnologies Kazan National Research Technological University Karl Marx St., 68 Kazan 420015 Russia, Department of Construction Materials Industrial University of Tyumen Tyumen 625000 Russia, Department of Engineering Physics and Radioelectronic Siberian Federal University Krasnoyarsk 660041 Russia, Department of Physics Far Eastern State Transport University Serysheva St. 47 Khabarovsk 680021 Russia, Institute of Inorganic and Analytical Chemistry Justus-Liebig-University Giessen Heinrich-Buff-Ring 17 35392 Giessen Germany, Institute of Physics Kazan Federal University Kremlevskaya St., 18 Kazan 420008 Russia, Kazan Federal University, Laboratory of Crystal Physics Kirensky Institute of Physics Federal Research Center KSC SB RAS Krasnoyarsk 660036 Russia, School of Natural Sciences Tyumen State University Tyumen 625003 Russia
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