Related Experiment Video
Updated: Jan 18, 2026
13:21
Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
15.3K
Charge-Transfer Complex κ-(BEST)2Cu2(CN)3 Analogous to Organic Spin Liquid Candidate
Takuya Kobayashi1,2, Kent A Sakurai1, Shinji Michimura1
1Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan.
Inorganic Chemistry
|September 10, 2025
Summary
The organic conductor κ-(BEST)₂Cu₂(CN)₃ exhibits semiconducting behavior and superconductivity under pressure. It serves as a reference material for understanding quantum spin liquid candidates like κ-(ET)₂Cu₂(CN)₃.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Organic Electronics
Background:
- The quantum spin liquid candidate κ-(ET)₂Cu₂ (CN)₃ exhibits enigmatic properties near the Mott transition.
- Understanding the factors influencing these properties, such as pressure and chemical substitution, is crucial.
Purpose of the Study:
- To investigate the structural, electrical, and magnetic properties of κ-(BEST)₂Cu₂ (CN)₃.
- To compare its properties with the related κ-(ET)₂Cu₂ (CN)₃ to elucidate the nature of quantum spin liquids.
- To explore the effect of chemical pressure on superconductivity and magnetic behavior.
Main Methods:
- Synthesis and characterization of κ-(BEST)₂Cu₂ (CN)₃ single crystals.
- Resistivity measurements under varying pressure conditions.
- Magnetic susceptibility measurements to probe spin dynamics.
Main Results:
- κ-(BEST)₂Cu₂ (CN)₃ shows semiconducting behavior, similar to κ-(ET)₂Cu₂ (CN)₃.
- Superconducting transition observed in κ-(BEST)₂Cu₂ (CN)₃ at approximately 4 K under ~0.1 GPa.
- κ-(BEST)₂Cu₂ (CN)₃ acts as a chemically pressurized analogue of κ-(ET)₂Cu₂ (CN)₃.
- Spin susceptibility of κ-(BEST)₂Cu₂ (CN)₃ is slightly larger and less temperature-dependent than κ-(ET)₂Cu₂ (CN)₃, deviating from localized spin models.
Conclusions:
- κ-(BEST)₂Cu₂ (CN)₃ is a valuable reference material for studying quantum spin liquid phenomena in κ-(ET)₂Cu₂ (CN)₃.
- The observed magnetic properties provide insights into frustrated spin systems near the Mott transition.
- Further theoretical research is stimulated by the anomalous magnetic behavior and its deviation from existing models.
More Related Videos
Related Concept Videos
03:02Colors and Magnetism
14.0K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.0K
02:42Valence Bond Theory
11.2K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.2K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
48.2K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
48.2K
02:57Coordination Number and Geometry
18.9K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
18.9K
01:07Ladder Diagrams: Complexation Equilibria
595
Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
595
00:43Complexometric Titration: Ligands
2.2K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.2K