Abstract
Organic–inorganic hybrid polyoxometalate (POM) compounds are a subset of materials with unique structures and physical/chemical properties. The combination of metal-organic coordination complexes with classical POMs not only provides a powerful way to gain multifarious new compounds but also affords a new method to modify and functionalize POMs. In parallel with the many reports on the synthesis and structure of new hybrid POM compounds, the application of these compounds for heterogeneous catalysis has also attracted considerable attention. The hybrid POM compounds show noteworthy catalytic performance in acid, oxidation, and even in asymmetric catalytic reactions. This review summarizes the design and synthesis of organic–inorganic hybrid POM compounds and particularly highlights their recent progress in heterogeneous catalysis.
Highlights
Polyoxometalates (POMs) represent a diverse family of anionic molecular species that consist of early transition metal ions and oxygen atoms with high negative charge, large molecular weight, Materials 2015, 8 and good solubility in polar solvents
The formation of organic–inorganic hybrid POM compounds is often described as a self-assemble process because of the intricate behavior of POMs, metal ions, and ligands during crystallization which causes a lot of difficulty in predicting the structure and composition of the products
A large number of organic–inorganic hybrid POM compounds with bulky or porous structures have been isolated by reaction of POMs, metal ions, and organic ligands under hydrothermal conditions in recent years
Summary
Polyoxometalates (POMs) represent a diverse family of anionic molecular species that consist of early transition metal ions and oxygen atoms with high negative charge, large molecular weight, Materials 2015, 8 and good solubility in polar solvents. By utilizing organic ligands with different coordination modes and configurations, a great number of organic–inorganic hybrid POM compounds have been isolated with diversified structures and topologies [25,26,27,28,29,30]. Besides their fascinating interest in crystallography, the application of organic–inorganic hybrid. The introduction of an organic ligand increases the porosity of the structure and provides a convenient way to modify the polarity of the framework Combining their structural clarity and water resistance, the organic–inorganic hybrid POM compounds may facilitate as a new type of POM-based catalysts having great potential in heterogeneous catalysis. We hope it will be beneficial in order to understand the relationship between the structure of hybrid POM compounds and their catalytic performance and to develop new hybrid POM heterogeneous catalysts
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