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Researchers identified a three-centre, single-electron bond linking three dysprosium atoms inside a fullerene cage. In a 2021 study, single-crystal X-ray diffraction established the unusual arrangement of the atoms, while density-functional-theory calculations supported the interpretation of its bonding. The result is a finding in molecular chemistry, not a consumer technology.
What molecule did the researchers make?
Fei Jin and colleagues synthesized and isolated Dy₃C₂@Ih(7)-C₈₀: a cluster containing three dysprosium atoms and two carbon atoms enclosed inside an 80-carbon fullerene cage. The notation places the encapsulated Dy₃C₂ cluster before the @ sign and identifies the cage after it.
The preparation used arc discharge of a graphite and Dy₂O₃ mixture. The researchers then isolated the fullerene by high-performance liquid chromatography (HPLC) and co-crystallized it with a corannulene-based host, as reported by Chemistry World.
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Single-crystal X-ray diffraction (SC-XRD) determined the molecule’s atomic arrangement. The Dy₃C₂ cluster takes what the authors call a “bat ray” configuration: the two-carbon C₂ unit sits above a triangle formed by the three dysprosium atoms.
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- The C₂ unit is approximately 1.66 Å above the plane of the Dy₃ triangle.
- The reported Dy–Dy separations are approximately 3.4 Å.
These are measurements reported for this particular molecule in Jin et al.’s 2021 Chemical Science paper; they are not general dimensions for fullerene cages. The authors describe the structure in the paper as showing that the encapsulated cluster adopts a “bat ray configuration” (Royal Society of Chemistry article).
How did the authors identify the three-centre bond?
The diffraction experiment determined the positions and geometry of the atoms. It did not directly image a bond or establish how the electrons were distributed. For that interpretation, the authors used density-functional-theory (DFT) calculations to analyze the electronic structure.
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Their analysis describes a formal charge distribution of (Dy₃)⁸⁺(C₂)²⁻@C₈₀⁶⁻ and identifies a singly occupied molecular orbital with bonding character shared across Dy–Dy–Dy. The authors interpret this orbital as a three-centre single-electron metal–metal bond and report it as the first such motif in molecular lanthanide chemistry.
“Caught in a cage” therefore describes the context that stabilizes the unusual cluster, not a bond seen directly in an X-ray image. The structural evidence comes from SC-XRD; the bond assignment is an electronic-structure interpretation supported by DFT. The paper’s supporting information and crystallographic-data listing are available through the publisher record.
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How does the dysprosium cluster compare with the scandium analogue?
The paper compares Dy₃C₂@Ih(7)-C₈₀ with the analogous Sc₃C₂@Ih(7)-C₈₀ cluster. The authors report different formal charge assignments and different metal–metal bonding interpretations:
| Cluster inside Ih(7)-C₈₀ | Formal charge distribution reported by the authors | Metal–metal bonding interpretation |
|---|---|---|
| Dy₃C₂ | (Dy₃)⁸⁺(C₂)²⁻@C₈₀⁶⁻ | A singly occupied orbital with Dy–Dy–Dy bonding character; interpreted as a three-centre single-electron bond |
| Sc₃C₂ | (Sc₃)⁹⁺(C₂)³⁻@C₈₀⁶⁻ | The authors report no metal–metal bonding in this case |
This is a focused comparison between the two clusters discussed in the study, not a general rule about all lanthanide or metal-containing fullerenes. The authors also report that electrochemical changes to the population of the Dy–Dy–Dy-bonding orbital can yield ionic species with strengthened or weakened Dy–Dy bonds. Those are findings about the molecular system, not demonstrations of a technological application.
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Why does the cage matter?
The C₈₀ cage encloses the reactive metal-carbide cluster, providing a molecular setting in which the unusual arrangement and electronic structure can be studied. The study’s significance is the reported bonding motif and its contrast with the scandium analogue. The cited sources establish a specialized synthesized research molecule and its characterization; they do not establish a consumer product or practical application.
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