Supramolecular Coordination Chemistry and Self-Assembly

Supramolecular coordination chemistry harnesses the directional bonding preferences of metal ions and organic ligands to construct discrete and extended architectures through self‐assembly. By judicious choice of metal coordination geometry and ligand design—often incorporating rigid angles or pre-organized binding motifs—researchers can programme the spontaneous formation of polygons, polyhedra, cages and networks under thermodynamic or kinetic control. These assemblies exploit reversible metal–ligand interactions to enable error correction, adaptive behaviour and dynamic reconfiguration. Applications span selective molecular recognition, confined catalysis, gas storage and separation, drug delivery and stimuli-responsive materials. Recent efforts have broadened the scope from homogeneous, solution-phase cages to soft, processable polymers and hybrid frameworks, emphasising hierarchical organisation and multifunctionality. The field continues to push towards systems that mimic the complexity of natural enzymes and cellular compartments through multicomponent, heteroleptic structures and responsive linkages.

Research from Nature Portfolio

Recent studies have demonstrated that discrete metal–organic polyhedra can be employed as “molecular monomers” in supramolecular polymerisation to yield amorphous but permanently porous soft materials. By controlling nucleation, elongation and cross-linking stages, researchers tuned macroscopic morphology from colloidal spheres to hierarchical gels, while preserving internal microporosity. Another approach has exploited a flexible, water-soluble coordination cage to encapsulate light-responsive spiropyran switches, showing that confinement need not impede reversible photoisomerisation and can even enhance switching efficiency in aqueous media. In addition, the assembly of homochiral D4-symmetric Pd–Ru metallacages has provided robust chiral cavities capable of enantioselective recognition and separation of atropisomeric compounds, illustrating how predetermined stereochemical configurations at metal centres can direct host–guest stereoselectivity in practical applications.

Supramolecular Coordination Chemistry and Self-Assembly publication trend

The graph below shows the total number of articles in supramolecular coordination chemistry and self-assembly across all publications each year (not limited to Nature Index journals).

Technical terms

Supramolecular coordination chemistry: The design and study of non-covalent assemblies formed by metal–ligand interactions.

Self-assembly: The spontaneous organisation of components into ordered structures driven by reversible interactions.

Metal–organic polyhedron (MOP): A discrete, cage-like assembly composed of metal nodes and organic linkers enclosing an internal cavity.

Host–guest chemistry: The encapsulation of one molecule (guest) within the cavity of another (host) through non-covalent interactions.

Heteroleptic assembly: The formation of metal-ligand complexes containing more than one type of ligand to introduce multifunctionality.

Microporosity: Presence of pores less than 2 nm in diameter, allowing selective adsorption of small molecules.

Photoisomerisation: A reversible change in molecular geometry induced by light absorption.

References

1. Self-assembly of metal–organic polyhedra into supramolecular polymers with intrinsic microporosity. Nature Communications (2018).
2. Reversible chromism of spiropyran in the cavity of a flexible coordination cage. Nature Communications (2018).
3. Homochiral D4-symmetric metal–organic cages from stereogenic Ru(II) metalloligands for effective enantioseparation of atropisomeric molecules. Nature Communications (2016).
4. Recent advances in supramolecular fullerene chemistry. Chemical Society Reviews (2024).
5. Enhancing the Photosensitivity of Hypocrellin A by Perylene Diimide Metallacage-Based Host–Guest Complexation for Photodynamic Therapy. Nano-Micro Letters (2024).
6. Increasing structural and functional complexity in self-assembled coordination cages. Chemical Science (2021).