Emerging trends in synthesis and application of chiral polyoxometalates.

Chiral polyoxometalates (cPOMs) are a class of inorganic organic hybrid materials that combine molecular chirality and metal oxygen cluster framework. They have both the chemical stability of inorganic polyoxometalates and the structural diversity of organic ligands. Unlike the traditional review which regards synthesis and application as a parallel separation field, this paper constructs a "hierarchical chiral transfer" framework to systematically explain the generation mechanism of molecular scale chirality, supramolecular scale transfer path and the amplification law of macro function. In view of the long-standing conceptual confusion in the field, this paper establishes a strict three-level classification system: type I (intrinsic chiral frameworks), type II (covalently induced chirality) and type III (chiral environment containing POM), and clearly defines the experimental diagnostic criteria and application scope of each type. This paper goes beyond the enumeration of isolated cases, systematically compares the traditional and new synthesis strategies, refines their common mechanism logic, and defines the cPOMs structure types that each method adapts to. At the application level, the quantitative performance of asymmetric catalysis, chiral recognition and separation, chiral optical materials and biomedical fields were compared, and the critical structure-activity relationship between chiral architecture parameters and functional output indicators was established. Conclusion three core bottlenecks are clearly pointed out: the chiral regulation mechanism is still at the empirical level, and the predictive correlation between reaction conditions and chiral framework is lacking; The large-scale preparation of enantiopure cPOMs has not yet been realized, and it is difficult to take into account the yield, purity and inter batch consistency; The data of operational stability and biosafety are seriously missing. Biomedical applications are still limited to in vitro proof of concept, and there is a transformation gap of 5-10 years. Four development directions are proposed, including mechanism decoding, large-scale manufacturing, stability engineering and biomedical safety integration. To sum up, this paper is not a simple literature compilation, but a research roadmap with clear mechanism foundation and clear critical guidance for the rational design of chiral inorganic organic hybrid materials.