Metal Cluster Chemistry

Metal clusters, comprising anywhere from a few to several dozen metallic atoms, occupy the transitional regime between discrete molecules and bulk solids. Their finite size endows them with discrete electronic states, “magic‐number” stabilities and highly under-co-ordinated surface atoms, yielding unique optical, electronic, magnetic and catalytic behaviours. Structural motifs range from icosahedral and decahedral frameworks to polyicosahedral and superatomic arrangements, the latter described by filling quantised electronic shells akin to atomic orbitals. Synthetic routes include gas‐phase aggregation, pulsed‐laser ablation, and wet‐chemical assembly of ligand-protected clusters, enabling precise nuclearity control. Advances in spectroscopies—such as photoelectron and infrared action methods—and in situ diffraction techniques have elucidated their size-dependent bonding and fluxionality. Computational tools, notably density functional theory coupled with global minimum searching, provide atomistic insight into structures, isomerisation pathways and electronic shell closures. Metal clusters find applications in single-site heterogeneous catalysis, hydrogen storage, plasmonics and molecular electronics, underlining their significance for energy conversion, environmental remediation and nanoscale device engineering.

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Metal Cluster Chemistry publication trend

The graph below shows the total number of articles in metal cluster chemistry across all publications each year (not limited to Nature Index journals).

Technical terms

Metal cluster: A finite assembly of metal atoms whose size-dependent electronic and geometric structure lies between that of single atoms and bulk materials.

Superatom: A cluster whose delocalised valence electrons occupy quantised shells analogous to atomic orbitals, leading to enhanced stability at certain “magic” electron counts.

Zintl cluster: An anionic polyanion of a p-block element formed by electron transfer from an electropositive metal, often exhibiting deltahedral frameworks governed by electron-counting rules.

Deltahedral cluster: A polyhedral aggregate whose faces are exclusively triangles, commonly described by Wade–Mingos skeletal electron-counting guidelines.

Density functional theory (DFT): A quantum-mechanical method that computes electronic structure and total energy of a system using the electron density as the fundamental variable.

HOMO–LUMO gap: The energy difference between the highest occupied and lowest unoccupied molecular orbitals, indicative of electronic stability and reactivity.

Pseudopotential: A simplified atomic potential that replaces core electrons with an effective potential, reducing computational cost in electronic-structure calculations.

Global minimum search: Algorithmic procedures—such as genetic algorithms or random structure searches—used to locate the lowest-energy cluster geometry on a complex potential-energy surface.

References

1. Clusters.
2. A comprehensive exploration of structural and electronic properties of molybdenum clusters. APL Materials (2024).
3. New global minimum conformers for the Pt19 and Pt20 clusters: low symmetric species featuring different active sites. Journal of Molecular Modeling (2024).