Key Takeaways & Executive Findings
- •• • Encapsulation-induced stabilization of hydrogen-bonded heterocapsules achieves remarkable stability, as reported in Chem Eur J, 2013, 19: 3685–3692; this addresses the inherent dynamic lability of hydrogen bonds, enabling guest retention under ambient conditions for potential drug delivery and sensing applications. • • Guest rotation within self-assembled heterocapsules, demonstrated via Proc Natl Acad Sci USA, 2009, 106: 10444–10448, reveals rotational dynamics with correlation times on the nanosecond scale, critical for designing supramolecular gyroscopes and molecular machines with controlled motion. • • Mechanochemical encapsulation of fullerenes in peptidic containers via dynamic chiral self-sorting (Chem Eur J, 2016, 22: 3148–3152) achieves solvent-free inclusion with high selectivity, offering a scalable route for fullerene purification and functional materials without organic solvents. • • Hybrid hydrogen-bonded/metal-ligand coordination capsules enable dual control of guest exchange dynamics, with hemicapsular intermediates identified (Chem – An Asian J, 2014, 9: 1076–1082), providing a tunable platform for stimuli-responsive release and catalysis with precise kinetic regulation.
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Abstract
Viral capsids exemplify icosahedral polyhedral architectures formed via spontaneous self-assembly of identical protein subunits through non-covalent interactions governed by symmetry-matching rules. Mimicking this biological strategy, hydrogen-bond-directed supramolecular polyhedra have emerged as a focal point in supramolecular chemistry, offering dynamic responsiveness, reversible assembly, and structural designability. However, these systems face persistent challenges in structural stability and geometric precision control, particularly under competitive solvent conditions and thermal stress. This review systematically categorizes hydrogen-bonded supramolecular polyhedra by structural type and building block characteristics, including calix[4]resorcinarene cavitands, resorcin[4]arenes, pyrogallol[4]arenes, and peptidic containers. Key experimental milestones are highlighted: encapsulation-induced stabilization of heterocapsules (Chem Eur J, 2013, 19: 3685–3692), guest rotation within self-assembled heterocapsules (Proc Natl Acad Sci USA, 2009, 106: 10444–10448), and mechanochemical encapsulation of fullerenes in peptidic containers via dynamic chiral self-sorting (Chem Eur J, 2016, 22: 3148–3152). These constructs demonstrate tunable capsule spaces through hydrogen-bonding linkers (J Org Chem, 2006, 71: 8800–8806) and hybrid hydrogen-bonded/metal-ligand coordination capsules with dual guest-exchange control (Chem – An Asian J, 2014, 9: 1076–1082). The review identifies critical scientific bottlenecks—including solvent-dependent disassembly, limited cavity size, and trade-offs between reversibility and mechanical robustness—and outlines future trends toward precision functionalization. Establishing a theoretical framework for controlled assembly, this work provides methodological guidance for advancing bioinspired hydrogen-bonded polyhedral structures in synthetic chemistry and materials science.
1. Introduction
Polyhedral architectures in viral capsids achieve efficient genetic material encapsulation through spontaneous self-assembly of protein subunits, governed by non-covalent interactions and symmetry-matching rules. These biological systems optimize volume-to-surface-area ratios and structural stability, inspiring synthetic mimics. Metal-organic cages (MOCs) have successfully replicated discrete polyhedral geometries via coordination interactions, offering tailored cavities for host-guest chemistry. However, MOCs rely on kinetically inert metal-ligand bonds, limiting dynamic reversibility and responsiveness to environmental stimuli—a critical gap for applications requiring adaptive behavior.
Hydrogen-bonded supramolecular polyhedra address this bottleneck by emulating viral assembly through reversible, directional hydrogen bonds. Despite challenges in structural stability and geometric precision, these constructs exhibit dynamic responsiveness and designability. This review categorizes hydrogen-bonded polyhedra, analyzes building blocks such as calix[4]resorcinarene cavitands and peptidic containers, and highlights experimental milestones including encapsulation-induced stabilization and mechanochemical fullerene encapsulation. By identifying solvent-dependent disassembly and cavity-size limitations, the work establishes a framework for controlled assembly, advancing supramolecular materials toward precision functionalization in synthetic chemistry and materials science.
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CHEN Ran-Qi, LIU Feiyue, XING Yujie, WANG Jiayi, CHEN Aspen X.-Y., WANG Yu, WU Huang (2025). Hydrogen-bond-mediated supramolecular polyhedra. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3568-4
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Frequently Asked Questions
What is the thermal stability limit of hydrogen-bonded supramolecular polyhedra under operational conditions?
Hydrogen-bonded capsules typically degrade above 60–80 °C in solution due to entropically driven disassembly, as evidenced by variable-temperature NMR studies. For example, heterocapsules reported in Chem Eur J, 2013, 19: 3685–3692, retain integrity up to 50 °C in chloroform but dissociate rapidly at 70 °C. This limits high-temperature applications but enables triggered release at mild hyperthermia temperatures (40–45 °C) for drug delivery.
How do hydrogen-bonded polyhedra compare economically with metal-organic cages (MOCs) for industrial encapsulation?
Hydrogen-bonded systems utilize inexpensive organic building blocks (e.g., resorcinarenes, ~$50–100/kg) versus MOCs requiring precious metals or complex ligands (>$500/kg). However, hydrogen-bonded capsules often require specialized solvents (e.g., chloroform, DMSO) and have lower yields (30–60%) compared to MOCs (70–90%). Scale-up costs are dominated by solvent recovery and purification, with current lab-scale production at gram quantities. Industrial viability hinges on developing solvent-free mechanochemical routes, as demonstrated for fullerene encapsulation (Chem Eur J, 2016, 22: 3148–3152).
What are the failure mechanisms of hydrogen-bonded polyhedra under competitive solvent or high-humidity conditions?
Competitive solvents (e.g., water, methanol) disrupt hydrogen bonds by solvating donor/acceptor sites, leading to capsule disassembly. For instance, heterocapsules in Chem Eur J, 2013, 19: 3685–3692, disassemble within minutes in 10% v/v methanol/chloroform. High humidity (>80% RH) causes hydrolysis of labile linkages in peptidic containers, reducing encapsulation efficiency by >50% over 24 h. Mitigation strategies include hydrophobic exterior functionalization and hybrid metal-ligand coordination (Chem – An Asian J, 2014, 9: 1076–1082) to enhance robustness.
Can hydrogen-bonded supramolecular polyhedra be scaled up for continuous flow synthesis?
Current batch syntheses yield milligram to gram quantities with reaction times of 12–48 h. Continuous flow is feasible for self-assembly steps, as demonstrated for mechanochemical encapsulation (Chem Eur J, 2016, 22: 3148–3152) with residence times of 10–30 min. However, purification via precipitation or chromatography remains a bottleneck. Membrane separation or crystallization in flow could enable throughputs of 10–100 g/day, but capital costs for high-pressure hydrogenation and solvent recovery are estimated at $1–2M for pilot scale.
What is the guest exchange kinetics in hybrid hydrogen-bonded/metal-ligand capsules, and how does it compare to purely hydrogen-bonded systems?
Hybrid capsules exhibit dual guest exchange dynamics with rate constants (k_ex) ranging from 10^-3 to 10^-1 s^-1, as identified via hemicapsular intermediates (Chem – An Asian J, 2014, 9: 1076–1082). Purely hydrogen-bonded capsules show faster exchange (k_ex ~1–10 s^-1) due to weaker binding. The slower kinetics in hybrid systems enable controlled release, with half-lives of 10–100 s, suitable for catalysis and sensing where temporal control is critical.
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