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Molecules, volume 28, issue 1, pages 418

Aerogel-Based Single-Ion Magnets: A Case Study of a Cobalt(II) Complex Immobilized in Silica

Kottsov Sergey Yu ¹

Shmelev M. A. ¹

Baranchikov Alexander E ¹

Kiskin Mikhail A. ¹

Sharipov Alim U ^{1, 2}

Efimov Nikolay N. ¹

Rubtsova Irina K ¹

Nikolaevskii Stanislav Alexandrovich ¹

Kopitsa G. P. ^{3, 4}

Khamova Tamara V ⁴

Roslyakov Ilya V. ^{1, 5}

Eremenko Igor L. ¹

Ivanov Vladimir K. ^{1, 6}

Hide authors affiliations Show authors affiliations: 6 affiliations

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow 119991, Russia |

Faculty of Technology of Inorganic Substances and High Temperature Materials, Mendeleev University of Chemical Technology of Russia, Moscow 125047, Russia |

St.-Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute”, Gatchina 188300, Russia

National Research Centre "Kurchatov Institute"

Petersburg Nuclear Physics Institute of NRC «Kurchatov Institute»

⁴

Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St.-Petersburg 199034, Russia |

⁵

Department of Materials Science, Lomonosov Moscow State University, Moscow 119991, Russia |

⁶

Faculty of Chemistry, National Research University Higher School of Economics, Moscow 109028, Russia |

Publication type: Journal Article

Publication date: 2023-01-03

Multidisciplinary Digital Publishing Institute (MDPI)

Journal: Molecules

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Quartile WOS

Impact factor: 4.6

ISSN: 14203049

DOI: 10.3390/molecules28010418

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Organic Chemistry

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Physical and Theoretical Chemistry

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Chemistry (miscellaneous)

Abstract

The chemical immobilization of cobalt(II) ions in a silica aerogel matrix enabled the synthesis of the first representative example of aerogel-based single-ion magnets. For the synthesis of the lyogels, methyl-trimethoxysilane and N-3-(trimethoxysilyl)propyl ethylenediamine were co-hydrolyzed, then the ethylenediamine groups that were immobilized on the silica matrix enabled the subsequent binding of cobalt(II) ions. Lyogels with various amounts of ethylenediamine moieties (0.1–15 mol %) were soaked in isopropanol solutions of cobalt(II) nitrate and further supercritically dried in carbon dioxide to obtain aerogels with a specific surface area of 210–596 m2·g−1, an apparent density of 0.403–0.740 cm3·g−1 and a porosity of 60–78%. The actual cobalt content in the aerogels was 0.01–1.50 mmol per 1 g of SiO2, which could easily be tuned by the concentration of ethylenediamine moieties in the silica matrix. The introduction of cobalt(II) ions into the ethylenediamine-modified silica aerogel promoted the stability of the diamine moieties at the supercritical drying stage. The molecular prototype of the immobilized cobalt(II) complex, bearing one ethylenediamine ligand [Co(en)(MeCN)(NO3)2], was synthesized and structurally characterized. Using magnetometry in the DC mode, it was shown that cobalt(II)-modified silica aerogels exhibited slow magnetic relaxation in a nonzero field. A decrease in cobalt(II) concentration in aerogels from 1.5 mmol to 0.14 mmol per 1 g of SiO2 resulted in a weakening of inter-ion interactions; the magnetization reversal energy barrier likewise increased from 4 to 18 K.

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Journal of Magnetism and Magnetic Materials	Journal of Magnetism and Magnetic Materials, 1, 50% Journal of Magnetism and Magnetic Materials 1 publication, 50%
Journal of Molecular Liquids	Journal of Molecular Liquids, 1, 50% Journal of Molecular Liquids 1 publication, 50%
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Elsevier	Elsevier, 2, 100% Elsevier 2 publications, 100%
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Kottsov S. Yu. et al. Aerogel-Based Single-Ion Magnets: A Case Study of a Cobalt(II) Complex Immobilized in Silica // Molecules. 2023. Vol. 28. No. 1. p. 418.

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Kottsov S. Yu., Shmelev M. A., Baranchikov A. E., Kiskin M. A., Sharipov A. U., Efimov N. N., Rubtsova I. K., Nikolaevskii S. A., Kopitsa G. P., Khamova T. V., Roslyakov I. V., Eremenko I. L., Ivanov V. K. Aerogel-Based Single-Ion Magnets: A Case Study of a Cobalt(II) Complex Immobilized in Silica // Molecules. 2023. Vol. 28. No. 1. p. 418.

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TY - JOUR

DO - 10.3390/molecules28010418

UR - https://doi.org/10.3390%2Fmolecules28010418

TI - Aerogel-Based Single-Ion Magnets: A Case Study of a Cobalt(II) Complex Immobilized in Silica

T2 - Molecules

AU - Kottsov, Sergey Yu

AU - Shmelev, M. A.

AU - Baranchikov, Alexander E

AU - Kiskin, Mikhail A.

AU - Sharipov, Alim U

AU - Efimov, Nikolay N.

AU - Rubtsova, Irina K

AU - Nikolaevskii, Stanislav Alexandrovich

AU - Kopitsa, G. P.

AU - Khamova, Tamara V

AU - Roslyakov, Ilya V.

AU - Eremenko, Igor L.

AU - Ivanov, Vladimir K.

PY - 2023

DA - 2023/01/03 00:00:00

PB - Multidisciplinary Digital Publishing Institute (MDPI)

SP - 418

IS - 1

VL - 28

SN - 1420-3049

ER -

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@article{2023_Kottsov,

author = {Sergey Yu Kottsov and M. A. Shmelev and Alexander E Baranchikov and Mikhail A. Kiskin and Alim U Sharipov and Nikolay N. Efimov and Irina K Rubtsova and Stanislav Alexandrovich Nikolaevskii and G. P. Kopitsa and Tamara V Khamova and Ilya V. Roslyakov and Igor L. Eremenko and Vladimir K. Ivanov},

title = {Aerogel-Based Single-Ion Magnets: A Case Study of a Cobalt(II) Complex Immobilized in Silica},

journal = {Molecules},

year = {2023},

volume = {28},

publisher = {Multidisciplinary Digital Publishing Institute (MDPI)},

month = {jan},

url = {https://doi.org/10.3390%2Fmolecules28010418},

number = {1},

pages = {418},

doi = {10.3390/molecules28010418}

}

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Kottsov, Sergey Yu., et al. “Aerogel-Based Single-Ion Magnets: A Case Study of a Cobalt(II) Complex Immobilized in Silica.” Molecules, vol. 28, no. 1, Jan. 2023, p. 418. https://doi.org/10.3390%2Fmolecules28010418.

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Multidisciplinary Digital Publishing Institute (MDPI)

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Molecules

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4.6

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14203049 (Print)

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