Tuning the electronic structure of organic–inorganic hybrid polyoxometalates: The crucial role of the covalent linkage

The covalent functionalization of polyoxometalates (POMs) can radically affect their redox properties and lead to applications in catalysis, energy storage and optics. This review covers the predominant organofunctionalization strategies employed and highlights the role that the POM-anchoring moiety plays in determining the electronic properties of the hybrid material.