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Atomically precise metal nanoclusters are an emerging class of precision nanomaterials and hold potential in many applications. Here, the authors devise a [Au₁₃Ag₁₂(PPh₃)₁₀Cl₈]⁺ nanocluster with two conformational isomers that can reversibly convert in response to temperature, and hence acts as a rotary nanomotor.

Constructing nanoparticle assemblies with atomic precision remains a major challenge in nanoscience. Here, the authors realize atomic‐level control over the 1D, 2D and hierarchical 3D assembly of Au nanoparticles by modulating the site‐specific surface ligands and associated counterions.

Revealing structural isomerism in nanoparticles remains a largely unresolved task. Here, the authors use several techniques, including single-crystal X-ray crystallography, to characterize two structural isomers of Au₃₈, and report their different optical and catalytic properties and differences in stability.

Little is known about the transition of a metal nanoparticle from the plasmonic to excitonic state. Here, the authors map this evolution in atomically precise gold nanoparticles, a critical step for understanding the origins of surface plasmon resonance, metallic bonding, and catalytic behaviour.

Chiral noble metal nanostructures are particularly interesting for optical materials and enantioselective catalysis. Here, the authors report the synthesis and crystal structure of a chiral Ag₂₃ nanocluster, whose twisted fcc skeleton is responsible for its chiral nature–an unusual property for silver.

Doping a metal nanocluster with heteroatoms dramatically changes its properties, but it remains difficult to dope with single-atom control. Here, the authors devise a strategy to dope single atoms of Ag or Cu into hollow Au nanoclusters, creating precise alloy nanoparticles atom-by-atom.

Atomically precise gold nanoclusters display useful photoluminescence properties, but limitations in synthetic methods and characterization techniques have hindered their detailed exploration. Here, a Au₃₈(PET)₂₆ nanocluster is found to exhibit fluorescence, phosphorescence, and thermally activated delayed fluorescence emissions, with a significant enhancement in photoluminescence intensity at cryogenic temperatures owing to the suppression of nonradiative pathways.

Ligand-protected gold nanoclusters are engineered to form complex arrangements of double and quadruple helices, which are based on the pairing of motifs on neighbouring enantiomers, akin to the base pairing seen in DNA double helices.

The formation pathway of shape-anisotropic nanoparticles is difficult to characterize and not well understood. The authors synthesize a prismatic-shaped Au₅₆ nanocluster as possible seed of a prismatic nanoparticle and characterize the structure and ligand bonding motifs, providing insight into the formation and surface protection mechanisms.

The formation of Marks truncated decahedra in nanoparticles is ubiquitous but the mechanism has not been fully understood. Here, the authors provide atomic-level insights by creating a non-truncated Au₅₂Cu₇₂(SR)₅₅ decahedral nanocluster and comparing it with the truncated homogold decahedra.

Excited-state structural and electronic changes, observed in molecules, are hampered in nanomaterials. Here the authors identify structural distortion and electron redistribution in three photoexcited gold nanoclusters, connecting molecular and nanocrystal regimes, enabled by flexibility of the tetrahedral core units.

Nanoparticles continue to find research and industrial applications, but no single technique exists to characterise their physical properties. Now, an analytical ultracentrifugation method is described which allows the simulataneous determination of nanoparticle size, density and molecular weight distribution.

The glomerulus can use its glycocalyx layer to precisely control renal clearance and tumour targeting of sub-nm gold nanoclusters with size differences of just a few atoms.

Nanoscience has progressed tremendously in the exploration of new phenomena not seen in bulk materials, however, the transition between nanoscale and bulk properties is not yet fully understood. Here the authors identify and discuss remaining open questions that call for future efforts.