Coordination Chemistry of Trinuclear Metal Complexes

Trinuclear metal complexes, featuring three metal centres bridged by organic ligands in cyclic or open frameworks, occupy a pivotal position in contemporary coordination chemistry. Their well-defined architectures enable precise control over metal–metal separations and ligand orientations, which in turn govern optical, electronic and catalytic properties. Such assemblies frequently exploit coinage metals (Cu, Ag, Au) and pyrazolate or imidazolate bridges to generate robust cyclic architectures. The emergent aurophilic, argentophilic or cuprophilic interactions between metal centres confer unique luminescent and redox behaviours. Moreover, fine-tuning of ligand substituents and solvent environment permits modulation of solvatomorphism and supramolecular aggregation, opening routes to stimuli-responsive materials. Applications range from molecular receptors for π-acids and fullerenes to precursors for heterogeneous catalysts, while computational studies underpin rational design by elucidating energetic preferences of ring sizes and metal–ligand bond character. The global significance of trinuclear motifs extends to sensing, photonics and sustainable catalysis, bolstered by the interplay of experimental crystallography, spectroscopy and theory.

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Coordination Chemistry of Trinuclear Metal Complexes publication trend

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

Technical terms

Cyclic trinuclear complex: A coordination assembly in which three metal centres are linked in a ring by bridging ligands.

Aurophilic interaction: A non-covalent attraction between gold(I) centres, analogous to hydrogen bonding, contributing to structure and luminescence.

π-basic: Describes a ligand or face rich in π-electron density, capable of donating to π-acidic guests.

Solvatomorphism: The occurrence of distinct crystal forms of a compound due to varying solvent inclusion.

Metallacycle: A cyclic complex in which metals alternately coordinate with ligands to form a ring architecture.

References

1. Molecular imine cages with π-basic Au 3 (pyrazolate) faces. Chemical Science (2024).
2. A Computational Study of Metallacycles Formed by Pyrazolate Ligands and the Coinage Metals M = Cu(I), Ag(I) and Au(I): (pzM)n for n = 2, 3, 4, 5 and 6. Comparison with Structures Reported in the Cambridge Crystallographic Data Center (CCDC). Molecules (2020).
3. Exploring the Interaction of Pyridine-Based Chalcones with Trinuclear Silver(I) Pyrazolate Complex. Inorganics (2023).
4. Investigation of Solvatomorphism and Its Photophysical Implications for Archetypal Trinuclear Au3(1-Methylimidazolate)3. Molecules (2021).
5. Synthesis of luminescent coumarin-substituted phosphinoamide-bridged polynuclear gold( i ) metallacycles and reactivity studies. Inorganic Chemistry Frontiers (2024).