Dinitrogen Activation in Metal Clusters

The conversion of inert dinitrogen into reactive nitrogen species lies at the heart of both biological nitrogen fixation and industrial ammonia synthesis. Metal clusters—nanometre-scale assemblies of metal atoms—have emerged as versatile platforms for probing the fundamental steps of N2 adsorption, activation and cleavage under well-defined conditions. Their discrete electronic states and tunable composition allow mechanistic insights into the weakening of the N≡N bond, closely mimicking both heterogeneous catalysts and enzymatic centres. Advances in spectroscopic techniques, particularly cryogenic infrared photodissociation spectroscopy, coupled with density functional theory, have elucidated adsorption motifs (end-on and side-on binding), cluster size effects and the energetic pathways for bond scission. Bimetallic and hydride-modified clusters are being designed to balance adsorption strength against activation barriers, offering the prospect of efficient, low-energy routes for ammonia synthesis. By unravelling the interplay between electronic structure, ligand coordination and reaction dynamics, research on metal cluster-mediated dinitrogen activation continues to guide the development of next-generation catalysts for sustainable nitrogen utilisation.

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Dinitrogen Activation in Metal Clusters publication trend

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Technical terms

Dinitrogen activation: The process by which the strong triple bond of N2 is weakened or cleaved to yield reactive nitrogen species.

Metal cluster: A finite assembly of metal atoms whose discrete electronic structure and size-dependent properties differ from bulk materials.

End-on coordination: An adsorption motif in which one atom of a diatomic molecule binds to a metal site along its bond axis.

Side-on coordination: A binding mode where multiple atoms of a diatomic molecule interact simultaneously with a metal centre, typically perpendicular to the bond axis.

Density functional theory (DFT): A quantum mechanical method used to model electronic structure and predict reaction energetics.

Cryogenic infrared photodissociation spectroscopy: A technique in which clusters are cooled and irradiated with infrared light to probe vibrational modes of adsorbed molecules and infer bonding motifs.

References

1. Cryo IR spectroscopy and cryo kinetics of dinitrogen activation and cleavage by small tantalum cluster cations. The Journal of Chemical Physics (2023).
2. Cryo spectroscopy of N2 on cationic iron clusters. The Journal of Chemical Physics (2021).
3. Cryo kinetics of N2 adsorption onto bimetallic rhodium–iron clusters in isolation. The Journal of Chemical Physics (2022).
4. Experimental and Theoretical Study of N2 Adsorption on Hydrogenated Y2C4H− and Dehydrogenated Y2C4− Cluster Anions at Room Temperature. International Journal of Molecular Sciences (2022).