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Magnetochemistry
Volume 11
Issue 3
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Magnetochemistry, Volume 11, Issue 3 (March 2025) – 4 articles

Cover Story (view full-size image): The copper/2,2′-bipyrimidine/iodide system was explored in water and at room temperature, with the intent of combining the reducing properties of the iodide ion towards Cu(II) with the protective effect of ligand coordination. The approach afforded, systematically, both the fully reduced Cu(I) chain of {[CuI2(μ-I)2(bpm)]}n, which is of broad interest for its well established optical and photocatalytic properties, and a structurally unprecedented regular alternating mixed-valent Cu(II)-Cu(I) chain of {[CuI(I3)CuII(I)(bpm)2](I3)}n, whose chemical nature was undoubtably validated through magneto-structural correlation analysis. Numerous I···I contacts between iodide and tri-iodide anions in the latter complex reasonably account for its excellent stability and striking synthetic reproducibility. View this paper
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7 pages, 1826 KiB  
Communication
Design of Fe7S8@Lip Composite for the pH-Selective and Magnetically Targeted Programmed Release of H2S
by Shenghua Wang, Hanlin Wei, Jialian Li, Ning Liu, Zhiming Deng and Junqing Huang
Magnetochemistry 2025, 11(3), 22; https://doi.org/10.3390/magnetochemistry11030022 - 14 Mar 2025
Viewed by 518
Abstract
The significance of hydrogen sulfide (H2S) release in vivo is multifaceted. It functions as a crucial gaseous signaling molecule with extensive physiological and pathological impacts within organisms. To create novel H2S-releasing materials, we synthesized Fe7S8@Lip, [...] Read more.
The significance of hydrogen sulfide (H2S) release in vivo is multifaceted. It functions as a crucial gaseous signaling molecule with extensive physiological and pathological impacts within organisms. To create novel H2S-releasing materials, we synthesized Fe7S8@Lip, a slow-release gas nanocomposite, which exhibits stable and sustained H2S-release properties. Our gas releaser possesses selective H2S-release capabilities, and, notably, it can achieve effective H2S release under magnetic force with the assistance of a magnetic field. In conclusion, our findings indicate that Fe7S8@Lip can serve as an H2S slow-release nanocomposite, offering a potentially innovative approach for programmed H2S release in vivo. Full article
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14 pages, 909 KiB  
Article
Fast Calculations for the Magnetohydrodynamic Flow and Heat Transfer of Bingham Fluids with the Hall Effect
by Ye Tian and Yi Liu
Magnetochemistry 2025, 11(3), 21; https://doi.org/10.3390/magnetochemistry11030021 - 12 Mar 2025
Viewed by 477
Abstract
This study examines a mathematical model to represent the magnetohydrodynamic flow and heat transfer of Bingham fluids. The model is subject to a magnetic field’s influence and incorporates the modified energy equation derived from Fourier’s law. For numerical computation, we utilize the spectral [...] Read more.
This study examines a mathematical model to represent the magnetohydrodynamic flow and heat transfer of Bingham fluids. The model is subject to a magnetic field’s influence and incorporates the modified energy equation derived from Fourier’s law. For numerical computation, we utilize the spectral collocation method in conjunction with the L1 algorithm to address this model. To minimize computational expenses, the sum-of-exponential technology is applied to efficiently solve the time-fractional coupled model. A specific example is provided to demonstrate the numerical method’s stability and the fast method’s efficiency. The results indicate that the numerical method converges with an accuracy of O(τ+N−r), and the fast method is highly effective in reducing computation times. Moreover, the parameters’ impacts on velocity and temperature are presented and discussed graphically. It is evident that as the Hall parameter increases, the peak velocity increases and the amplitude of temperature fluctuations gradually increases, although the peak temperature decreases. The Brinkman number has a significant impact on the heat transfer rate. Meanwhile, as the Hartmann number increases, the inhibitory effect of the magnetic field on the flow is amplified. Full article
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16 pages, 3094 KiB  
Article
Chemical and Structural Versatility in the Copper/2,2′-Bipyrimidine/Iodide System: A Regular Alternating Mixed-Valent Cu(II)-Cu(I) Chain Showing Unusually Similar Metal Coordination Environments
by Nadia Marino, Francesc Lloret, Miguel Julve and Giovanni De Munno
Magnetochemistry 2025, 11(3), 20; https://doi.org/10.3390/magnetochemistry11030020 - 5 Mar 2025
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Abstract
The reaction in reagent grade acetone of copper(II) nitrate hexahydrate, 2,2′-bipyrimidine (bpm) and potassium iodide in a 1:2:2 molar ratio afforded three different products: an unreduced Cu(II) species, a fully reduced Cu(I) species and a mixed-valent Cu(II)/Cu(I) species. Of these, only the unreduced [...] Read more.
The reaction in reagent grade acetone of copper(II) nitrate hexahydrate, 2,2′-bipyrimidine (bpm) and potassium iodide in a 1:2:2 molar ratio afforded three different products: an unreduced Cu(II) species, a fully reduced Cu(I) species and a mixed-valent Cu(II)/Cu(I) species. Of these, only the unreduced Cu(II) complex of formula [CuII(bpm)3](I3)(I) (1) could be structurally characterized, the other two products being initially only isolated as amorphous powders. X-ray quality, beautifully shaped, quasi-black prismatic crystals of compound 2, namely {[CuI(I3)CuII(I)(bpm)2](I3)}n, and brick-reddish parallelepipeds of compound 3, namely {[CuI2 (μ-I)2(bpm)]}n, were successively obtained through the slow diffusion in H-shaped tubes of aqueous solutions of the three reagents, after extensive optimization of the crystallization conditions. Compound 1 consists of a rare tris(2,2′-bipyrimidine)copper(II) monomeric dication, charge balanced by both iodide and triiodide anions. Compound 3, whose structure as well as optical and photocatalytic properties were recently disclosed, consists of a regular alternating μ-bpm/di-μ-iodide copper(I) chain. Finally, compound 2 consists of a rare, regular alternating mixed-valent Cu(II)-Cu(I) μ-bpm copper chain, showing unusual similarities in the metal coordination environment. The magnetic properties of compound 2 remarkably reveal a very weak antiferromagnetic coupling between the paramagnetic Cu(II) ions which are well separated both intra- and inter-chain. Full article
(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)
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19 pages, 5561 KiB  
Article
Study on the Influence of Hall Effect on the Performance of Disk Generation Channel
by Linyong Li, Guang Wang, Yingke Liao, Qing Wu and Peijie Ning
Magnetochemistry 2025, 11(3), 19; https://doi.org/10.3390/magnetochemistry11030019 - 4 Mar 2025
Viewed by 531
Abstract
Compared to the Faraday-type power generation channel structure, the disk-type power generation channel offers several advantages, including a simpler structure, higher enthalpy extraction efficiency, and greater power density. These features effectively reduce the requirements for magnetic systems, making it a priority development direction [...] Read more.
Compared to the Faraday-type power generation channel structure, the disk-type power generation channel offers several advantages, including a simpler structure, higher enthalpy extraction efficiency, and greater power density. These features effectively reduce the requirements for magnetic systems, making it a priority development direction for space nuclear magnetohydrodynamic (MHD) power generation channels. The disk power generation channel utilizes the Hall effect for power generation; however, the impact of the Hall effect on current distribution, plasma characteristics, conductivity, and other parameters within the disk-type power generation channel remains unclear. A mathematical model of a plasma MHD power generation channel was established using a He/Xe mixed gas as the working fluid. Numerical simulations were conducted to investigate the performance of the disk-shaped power generation channel under varying Hall parameters. The research findings indicate that a strong circular Faraday current forms near the anode, leading to significant anode erosion. The Hall effect significantly influences plasma stability, with stronger Hall effects resulting in reduced plasma stability. Conductivity between the electrodes gradually increases from the anode to the cathode, becoming more pronounced as the Hall effect intensifies. By enhancing the Hall effect, the enthalpy extraction rate is significantly improved, electrical efficiency asymptotically approaches 50%, and the overall performance of the power generation channel is substantially enhanced. Full article
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