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Molecular Bistability in Metal Complexes
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Molecular Bistability in Metal Complexes

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Inorganic Chemistry".

Deadline for manuscript submissions: closed (31 March 2024) | Viewed by 3654

Special Issue Editor

Dr. Dong Shao

E-Mail Website
Guest Editor
Hubei Key Laboratory of Processing and Application of Catalytic Materials, College of Chemistry and Chemical Engineering, Huanggang Normal University, Huanggang 438000, China
Interests: single-molecule magnets; spin-crossover (SCO) complexes;spin crossover; magnetic anisotropy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Single-molecule magnets (SMMs) and spin-crossover (SCO) complexes have been intensively pursued as magnetic bistable materials. For magnetic bistability in SMMs, potential applications in high-density information storage, quantum computing, and molecular spintronics have been envisaged. In addition, many fascinating physical phenomena, such as the quantum tunneling of magnetization (QTM), Berry-phase interference, and quantum coherence, have been observed in SMMs. Such quantum-mechanical behaviors observed in a macroscopic system make SMMs a connection between the macroscopic classical world and the microscopic quantum world. SCO complexes are natural bistable molecules due to their electronic conversion between low-spin (LS) and high-spin (HS) states in the presence of an external stimulus, such as temperature, light, and pressure. They have potential applications in switches, sensors, and memory devices. Over the past decades, a myriad of SMMs and SCO complexes with various structures and magnetic performances have been synthesized and characterized. However, new bistable molecules are still needed to fully achieve their practical applications.

Dr. Dong Shao
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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Keywords

  • single-molecule magnet
  • spin crossover
  • magnetic anisotropy
  • electron transfer
  • multifunctional magnetic materials
  • ab initio calculation

Published Papers (2 papers)

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Research

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13 pages, 3891 KiB  
Article
Cyclic [Cu-biRadical]2 Secondary Building Unit in 2p-3d and 2p-3d-4f Complexes: Crystal Structure and Magnetic Properties
by Xiao-Tong Wang, Xiao-Hui Huang, Hong-Wei Song, Yue Ma, Li-Cun Li and Jean-Pascal Sutter
Molecules 2023, 28(6), 2514; https://doi.org/10.3390/molecules28062514 - 09 Mar 2023
Viewed by 1282
Abstract
Employing the new nitronyl nitroxide biradical ligand biNIT-3Py-5-Ph (2-(5-phenyl-3-pyridyl)-bis(4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide)), a 16-spin Cu-radical complex, [Cu8(biNIT-3Py-5-Ph)4(hfac)16] 1, and three 2p-3d-4f chain complexes, {[Ln(hfac)3][Cu(hfac)2]2(biNIT-3Py-5-Ph)2}n (LnⅢ= Gd 2, [...] Read more.
Employing the new nitronyl nitroxide biradical ligand biNIT-3Py-5-Ph (2-(5-phenyl-3-pyridyl)-bis(4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide)), a 16-spin Cu-radical complex, [Cu8(biNIT-3Py-5-Ph)4(hfac)16] 1, and three 2p-3d-4f chain complexes, {[Ln(hfac)3][Cu(hfac)2]2(biNIT-3Py-5-Ph)2}n (LnⅢ= Gd 2, Tb 3, Dy 4; hfac = hexafluoroacetylacetonate), have been prepared and characterized. X-ray crystallographic analysis revealed in all derivatives a common cyclic [Cu-biNIT]2 secondary building unit in which two bi-NIT-3Py-5-Ph biradical ligands and two CuII ions are associated via the pyridine N atoms and NO units. For complex 1, two such units assemble with four additional CuII ions to form a discrete complex involving 16 S = 1/2 spin centers. For complexes 2–4, the [Cu-biNIT]2 units are linked by LnIII ions via NO groups in a 1D coordination polymer. Magnetic studies show that the coordination of the aminoxyl groups with Cu or Ln ions results in behaviors combining ferromagnetic and antiferromagnetic interactions. No slow magnetic relaxation behavior was observed for Tb and Dy derivatives. Full article
(This article belongs to the Special Issue Molecular Bistability in Metal Complexes)
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Review

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34 pages, 11023 KiB  
Review
The Influence of the Substrate on the Functionality of Spin Crossover Molecular Materials
by Saeed Yazdani, Jared Phillips, Thilini K. Ekanayaka, Ruihua Cheng and Peter A. Dowben
Molecules 2023, 28(9), 3735; https://doi.org/10.3390/molecules28093735 - 26 Apr 2023
Cited by 10 | Viewed by 2048
Abstract
Spin crossover complexes are a route toward designing molecular devices with a facile readout due to the change in conductance that accompanies the change in spin state. Because substrate effects are important for any molecular device, there are increased efforts to characterize the [...] Read more.
Spin crossover complexes are a route toward designing molecular devices with a facile readout due to the change in conductance that accompanies the change in spin state. Because substrate effects are important for any molecular device, there are increased efforts to characterize the influence of the substrate on the spin state transition. Several classes of spin crossover molecules deposited on different types of surface, including metallic and non-metallic substrates, are comprehensively reviewed here. While some non-metallic substrates like graphite seem to be promising from experimental measurements, theoretical and experimental studies indicate that 2D semiconductor surfaces will have minimum interaction with spin crossover molecules. Most metallic substrates, such as Au and Cu, tend to suppress changes in spin state and affect the spin state switching process due to the interaction at the molecule–substrate interface that lock spin crossover molecules in a particular spin state or mixed spin state. Of course, the influence of the substrate on a spin crossover thin film depends on the molecular film thickness and perhaps the method used to deposit the molecular film. Full article
(This article belongs to the Special Issue Molecular Bistability in Metal Complexes)
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