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Magnetochemistry, Volume 10, Issue 11

November 2024 - 11 articles

Cover Story: The strong magnetic interaction in a "sweet couple" of a radical coordinated to a metal ion is attractive for the design of molecular magnetic materials. The octahedral cobalt(II) complexes of nitroxides are non-trivial in terms of modelling their magnetic behavior due to the unquenched orbital momentum of Co2+. For the dimer, {Co-bisnitroxide-Co}, the experimental magnetic study indicates a strong antiferromagnetic coupling between the metal ion and the diradical, as well as between the spins of the latter, thus forming a spin-frustrated system. An original theoretical approach has been developed to determine the range of possible values for both types of exchange integrals. The ab initio computation results for the χT(T) and M(H) dependences are in good agreement with the experimental data. View this paper
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Articles (11)

  • Article
  • Open Access
5 Citations
1,870 Views
18 Pages

Macroscopic and Microscopic Levels of Methylene Blue Adsorption on a Magnetic Bio-Based Adsorbent: In-Depth Study Using Experiments, Advanced Modeling, and Statistical Thermodynamic Analysis

  • Mohamed A. Ali,
  • Aliaa M. Badawy,
  • Ali Q. Seliem,
  • Hazem I. Bendary,
  • Eder C. Lima,
  • M. Al-Dossari,
  • N. S. Abd EL-Gawaad,
  • Glaydson S. dos Reis,
  • Mohamed Mobarak and
  • Ali M. Hassan
  • + 1 author

A magnetic bio-based adsorbent derived from H2O2-activated zeolite and turmeric carbohydrate polymer was fabricated, characterized, and utilized in removing methylene blue (MB) dye at pH 8.0 and temperatures between 25 and 55 °C. To understand th...

  • Review
  • Open Access
3 Citations
1,764 Views
23 Pages

In recent decades, the chemistry of transition metal coordination compounds has undergone continuous development at both scientific and application levels. The diversity of metal(II) complexes, along with their structural features and physicochemical...

  • Article
  • Open Access
1 Citations
1,423 Views
12 Pages

A Bifurcated Reconnecting Current Sheet in the Turbulent Magnetosheath

  • Shimou Wang,
  • Rongsheng Wang,
  • Kai Huang and
  • Jin Guo

We report the Magnetospheric Multiscale (MMS) observation of a bifurcated reconnecting current sheet in Earth’s dayside magnetosheath. Typical signatures of the ion diffusion region, including sub-Alfvénic demagnetized ion outflow, super...

  • Article
  • Open Access
1 Citations
1,555 Views
15 Pages

The complex dielectric permittivity, ε (f, H) = ε′ (f, H) − i ε″ (f, H), in the microwave frequency range f, of (0.1–3) GHz and polarizing field values H, in the range of (0–135) kA/m, was measure...

  • Article
  • Open Access
3 Citations
3,025 Views
24 Pages

Magnetic CuFe2O4 Nanoparticles Immobilized on Modified Rice Husk-Derived Zeolite for Chlorogenic Acid Adsorption

  • Tainara Ramos Neves,
  • Letícia Ferreira Lacerda Schildt,
  • Maria Luiza Lopes Sierra e Silva,
  • Vannyla Viktória Viana Vasconcelos,
  • Corrado Di Conzo,
  • Francesco Mura,
  • Marco Rossi,
  • Gaspare Varvaro,
  • Maryam Abdolrahimi and
  • Simone Quaranta
  • + 2 authors

Adsorption has emerged as a promising method for removing polyphenols in water remediation. This work explores chlorogenic acid (CGA) adsorption on zeolite-based magnetic nanocomposites synthesized from rice husk waste. In particular, enhanced adsorb...

  • Article
  • Open Access
3 Citations
2,359 Views
12 Pages

Two New 2p–3d Metal Complexes with a Nitronyl-Nitroxide Ligand Derived from o-Vanillin: Synthesis, Crystals Structures and Magnetic Properties

  • Cristian Andrei Spinu,
  • Daniel O. T. A. Martins,
  • Teodora Mocanu,
  • Mihaela Hillebrand,
  • Jean-Pascal Sutter,
  • Floriana Tuna and
  • Marius Andruh

Two new 2p–3d complexes, (Et3NH)[ML(hfac)2], have been obtained using the nitronyl-nitroxide radical (HL) derived from 2-hydroxy-3-methoxy-5-nitrobenzaldehyde (M = Mn 1; Co 2). The two compounds are isomorphous and their structures consist of a...

  • Article
  • Open Access
1,448 Views
13 Pages

Slow Magnetic Relaxation in a [Co4O4] Cubane Complex with Tridentate NNO-Schiff Base Ligands

  • Yuki Suemitsu,
  • Yoshitaka Amakusa,
  • Haruka Yoshino,
  • Masaaki Ohba and
  • Masayuki Koikawa

Two tetranuclear Co(II) complexes, [Co4(pmab)4Cl4] (1) and [Co4(pmab)4(OBz)2]Cl2 (2) [Hpmab = 2-{(p-pyridinylmethylene)amino}benzenemethanol], have been synthesized and characterized through single-crystal X-ray diffraction, IR and UV-VIS spectroscop...

  • Article
  • Open Access
1,189 Views
11 Pages

The paramagnetic defects and radiation-induced paramagnetic centers (PCs) in silica opals can play a crucial role in determining the magnetic and electronic behavior of materials and serve as local probes of their electronic structure. Systematic inv...

  • Review
  • Open Access
4 Citations
4,003 Views
23 Pages

This review reports a critical study on the effect of magnetic fields on the precipitation process of calcium carbonate scale from hard water. Indeed, the harmful consequences of the water scaling phenomenon urged researchers to find effective soluti...

  • Article
  • Open Access
1 Citations
1,860 Views
15 Pages

Strong Antiferromagnetic Interactions in the Binuclear Cobalt(II) Complex with a Bridged Nitroxide Diradical

  • Vitaly A. Morozov,
  • Eugenia V. Peresypkina,
  • Wolfgang Wernsdorfer and
  • Kira E. Vostrikova

A binuclear cobalt–radical complex formed by the reaction of Co(hfac)2·2H2O (hfac = hexafluoroacetylacetonate) with the 2,2-bis(1-oxyl-3-oxide-4,4,5,5-tetramethylimidazolinyl) biradical (BR) has been synthesized. The complex {(hfac)CoII(...

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Magnetochemistry - ISSN 2312-7481