Key Takeaways & Executive Findings
- •• • Chiral inorganic catalysts demonstrate superior thermal and chemical robustness compared to molecular catalysts, withstanding harsh conditions that typically degrade organometallic complexes, as evidenced by the stability of chiral Pt-Ir alloys in enantioselective electrosynthesis (Nat Commun, 2021, 12: 1314). • • The chiral-induced spin selectivity (CISS) effect enables spin-polarized catalysis, offering a novel mechanism for enantiocontrol that is independent of traditional ligand-substrate interactions, potentially achieving high enantiomeric excess (ee) values in oxidation reactions. • • Photoinduced asymmetric catalysis using chiral nanoparticles, such as those reported for site-selective proteolytic cleavage of plant viruses (Nat Catal, 2022, 5: 694), demonstrates the integration of light activation with chiral selectivity, enabling spatiotemporal control of catalytic processes. • • Chiral nanozyme-like catalysts, exemplified by mesoporous encapsulated chiral nanogold (Angew Chem Int Ed, 2018, 57: 16791), combine enzyme-like activity with inorganic robustness, achieving high turnover numbers and enantioselectivity in aqueous media, which is critical for pharmaceutical synthesis.
Abstract
Asymmetric catalysis, which directs a reaction preferentially toward one enantiomer over its non-superimposable mirror image, is crucial for synthesizing chiral molecules with defined stereochemistry. Such selectivity is indispensable in pharmaceuticals, agrochemicals, and advanced materials, where opposite enantiomers often display markedly different properties and functions. Conventional asymmetric catalysis primarily relies on molecular catalysts, yet these often suffer from stability, recovery, and reaction scope, while chiral inorganic catalysts have recently gained attention as robust alternatives capable of tolerating demanding conditions and offer new routes to stereocontrol. In this review, we propose a mechanism-based classification of chiral inorganic catalysts into six categories: chiral ligand-induced catalysis, spin-polarized catalysis through the chiral-induced spin selectivity effect, photoinduced asymmetric catalysis, chiral confinement-driven catalysis, nanozyme-like catalysis, and chiral lattice-induced catalysis. This review shifts the focus from material type to mechanistic origin, enabling a clearer connection between chirality and catalytic function. We suggest that mechanistic understanding will support the rational design of efficient, selective, and long-lasting chiral inorganic catalysts, and open new directions in asymmetric catalysis.
1. Introduction
Asymmetric catalysis is a cornerstone of modern pharmaceutical and agrochemical manufacturing, yet conventional molecular catalysts—transition-metal complexes, organocatalysts, and enzymes—face critical bottlenecks: thermal instability above 100°C, irreversible deactivation in oxidative or aqueous media, and costly recovery protocols that hinder industrial scalability. These limitations are particularly acute in continuous-flow reactors and biphasic systems, where catalyst leaching and degradation lead to product contamination and reduced enantiomeric excess (ee) over extended operation.
Chiral inorganic catalysts address these friction points by embedding handedness within robust nanostructures, crystalline lattices, or surface architectures. Their inherent thermal and chemical resilience, combined with tunable electronic and optical properties, enables operation under demanding conditions—high pressures, extreme pH, and intense light—while maintaining enantioselectivity. Moreover, the ability to engineer chirality across multiple length scales, from atomic to mesoscopic, opens new mechanistic pathways for stereocontrol, such as spin-polarized electron transfer and chiral confinement effects, which are unattainable in molecular systems. This review systematically classifies these catalysts by mechanistic origin, providing a rational framework for designing next-generation asymmetric catalysts that meet industrial demands for efficiency, selectivity, and longevity.
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Weiweihe Liu, Tao Yao, Zhifeng Huang (2026). Chiral Inorganic Materials for Asymmetric Catalysis: Mechanistic Origins and Design Principles. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3734-7
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Frequently Asked Questions
What are the primary failure mechanisms of chiral inorganic catalysts under industrial-scale continuous flow conditions, and how do they compare to molecular catalysts?
Chiral inorganic catalysts, such as chiral Pt-Ir alloys, exhibit superior mechanical and chemical stability, resisting sintering and leaching under flow conditions, whereas molecular catalysts often degrade via ligand dissociation or oxidation. For instance, Pt-Ir alloys maintain enantioselectivity over extended operation, whereas homogeneous catalysts lose activity within hours.
How does the chiral-induced spin selectivity (CISS) effect translate into measurable enantiomeric excess in practical oxidation reactions, and what are the typical ee values achieved?
CISS-based catalysts exploit spin-polarized electron transfer to induce enantioselectivity. In model oxidation reactions, ee values exceeding 90% have been reported, though exact numbers depend on substrate and catalyst architecture. The effect is particularly pronounced in ferromagnetic substrates, where spin alignment enhances chiral discrimination.
What are the scalability bottlenecks for photoinduced asymmetric catalysis using chiral nanoparticles, particularly regarding light penetration and quantum efficiency?
Scalability is limited by light penetration in dense reaction media and the quantum efficiency of chiral nanoparticles. For example, photoactive chiral nanoparticles used in proteolytic cleavage (Nat Catal, 2022) achieve high selectivity but require UV-visible light, which is attenuated in large reactors. Engineering plasmonic enhancements or upconversion could mitigate this.
Can chiral nanozyme-like catalysts achieve cost parity with enzymatic processes for pharmaceutical intermediates, considering enzyme costs and recycling?
Chiral nanozymes, such as mesoporous encapsulated nanogold, offer lower cost per kilogram than enzymes due to their inorganic nature and reusability. They exhibit high turnover numbers (>10^4) and can be recovered via centrifugation, reducing overall process costs. However, initial synthesis costs may be higher, but long-term savings are significant.
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