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Researchers identified a rare three-centre, single-electron metal–metal bonding motif in a dysprosium carbide cluster enclosed within a fullerene molecule. The crystal structure shows how the atoms are arranged; the bond itself is an electronic-structure interpretation supported by computational analysis.
What molecule did the researchers study?
Fei Jin and colleagues synthesized and isolated Dy₃C₂@Ih(7)-C₈₀: a cluster containing three dysprosium atoms and two carbon atoms inside a C₈₀ fullerene cage. The notation “@” indicates that the cluster is enclosed by the carbon cage.
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The preparation, as described by Chemistry World, used arc discharge of graphite and dysprosium oxide (Dy₂O₃). The researchers then isolated the fullerene by high-performance liquid chromatography and co-crystallized it with a corannulene-based host to obtain crystals for analysis.
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What did the crystal structure show?
Single-crystal X-ray diffraction (SC-XRD) established the arrangement of the atoms in the encapsulated cluster. Jin et al. describe the shape as a “bat ray” configuration: the two-carbon unit sits above a triangular arrangement of three dysprosium atoms. The authors report that the C₂ unit is approximately 1.66 Å above the plane of the three Dy atoms, with Dy–Dy separations of approximately 3.4 Å. These measurements refer to this molecule, not to fullerenes generally.
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Diffraction determines the molecular structure from the crystal. It does not directly photograph or image an electron bond between the dysprosium atoms.
How did the authors identify the three-centre bond?
To interpret the molecule’s electronic structure, the researchers used density functional theory (DFT). They describe its formal charge distribution as (Dy₃)⁸⁺(C₂)²⁻@C₈₀⁶⁻ and identify a singly occupied molecular orbital with bonding character spread across all three Dy atoms. From that analysis, they assign a three-centre, single-electron Dy–Dy–Dy bond.
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The distinction matters: SC-XRD provides the observed atomic arrangement, while the bonding assignment rests on the computational analysis of the electronic structure. Jin et al. reported this as the first such three-centre single-electron metal–metal bonding motif in molecular lanthanide chemistry.
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How does the dysprosium cluster compare with the scandium analogue?
The paper compares Dy₃C₂@Ih(7)-C₈₀ with the related Sc₃C₂@Ih(7)-C₈₀. The authors report different formal charge distributions and bonding interpretations:
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| Cluster | Formal charge distribution reported by the authors | Metal–metal bonding interpretation |
|---|---|---|
| Dy₃C₂@Ih(7)-C₈₀ | (Dy₃)⁸⁺(C₂)²⁻@C₈₀⁶⁻ | A singly occupied orbital with Dy–Dy–Dy bonding character; assigned as a three-centre single-electron bond. |
| Sc₃C₂@Ih(7)-C₈₀ | (Sc₃)⁹⁺(C₂)³⁻@C₈₀⁶⁻ | The authors report no metal–metal bonding in this case. |
This is a comparison between the two compounds examined in the study, not a general rule about all dysprosium, scandium, or fullerene clusters.
What role did electrochemistry play?
The authors report that electrochemical changes to the population of the Dy–Dy–Dy-bonding orbital can produce ionic forms in which the Dy–Dy bonds are strengthened or weakened. This describes how the calculated bonding motif responds in this specific molecular system; it does not demonstrate a device, material application, or consumer product.
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Where can readers find the paper and its data?
The primary report is Fei Jin et al., “Stabilizing a three-center single-electron metal–metal bond in a fullerene cage,” Chemical Science 12 (2021), 6890–6895, DOI 10.1039/D1SC00965F. The Royal Society of Chemistry article record includes links to the paper’s supplementary information and crystallographic-data listing.
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