Metallophilic Interactions in Coordination Complexes

Metallophilic interactions are non-covalent attractions between closed-shell metal centres, typically involving d10 electron configurations, that lead to short intermetallic distances often comparable to or shorter than the sum of van der Waals radii. These interactions can be observed in a range of transition-metal complexes—most notably Au(I), Ag(I), Cu(I) and Zn(II)—and arise from a combination of dispersion forces, relativistic effects (for heavier metals) and weak orbital overlap. In coordination complexes, metallophilicity influences molecular geometry, crystal packing, photophysical properties and catalytic reactivity. For instance, aurophilic contacts between gold centres can preorganise mononuclear units into emissive excimers or exciplexes, whereas cuprophilic and argentophilic interactions have been exploited to tune luminescence, redox behaviour and structural flexibility. Recent advances in spectroscopic, crystallographic and computational methods have clarified the balance between electrostatic, dispersion and orbital contributions, revealing that relativistic corrections and medium-range correlation are essential to capture bond energies and geometries accurately. The global significance of metallophilic interactions spans from the design of responsive materials—such as thermochromic luminescent films—to mechanistic insights in metal-mediated catalysis, underscoring their practical applications in sensing, light harvesting and fine chemical synthesis.

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Metallophilic Interactions in Coordination Complexes publication trend

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Technical terms

Metallophilic interaction: A weak, non-covalent attraction between two closed-shell metal centres, often involving d10 electron configurations, that shortens intermetallic distances beyond van der Waals expectations.

Aurophilicity: A subtype of metallophilic interaction specific to gold(I) centres, driven by relativistic effects and dispersion forces, leading to short Au⋅⋅⋅Au contacts and unique photophysical properties.

Coordination complex: A chemical species comprising a central metal ion bonded to surrounding ligands through coordinate covalent bonds, forming well-defined geometries.

d10–d10 interaction: Metallophilic attraction between metal centres with filled d orbitals, typically enhancing orbital overlap and dispersion contributions.

QTAIM (Quantum Theory of Atoms In Molecules): A computational framework that analyses electron density topology to characterise bonding interactions, critical for quantifying metallophilicity.

References

1. Visible Light Responsive Dinuclear Zinc Complex Consisting of Proximally Arranged Two d10‐Zinc Centers**. Angewandte Chemie International Edition (2023).
2. Crystal Structure and Chemical Bonds in [CuII2(Tolf)4(MeOH)2]∙2MeOH. International Journal of Molecular Sciences (2023).
3. Excimer and Exciplex Formation in Gold(I) Complexes Preconditioned by Aurophilic Interactions. Angewandte Chemie International Edition (2020).
4. Aurophilic Interactions Studied by Quantum Crystallography. Inorganic Chemistry (2022).