Dear Colleagues,

Since the first Y-ray structure of H₃PW₁₂O₄₀.5H₂O, by J.F. Keggin, in 1933, the polyoxometalate chemistry has always been an attractive domain and has held the attention of numerous academic and even industrial laboratories, from more than 10 countries worldwide. While as, originally, polyoxometalates were thought of as models with which to study the reactivity of oxygen atoms on an oxide surface, the intrinsic properties of POMs have made them a attractive and unique molecular species. At the end of 20^th century, POM chemistry was known as a new field of investigation, involving the design of organic inorganic hybrids, from molecular species to 3D materials. The combination of an inorganic entity with an organic entity presents new perspectives in terms of properties and applications compared to individual entities. So, due to these considerations and synergies between POMS and organic entities, these polyoxometallic clusters constitute a real asset to the design of organic inorganic hybrid compounds or materials. This new field based on POMs can be organized in two main distinct areas: covalent hybrids and non-covalent hybrids. In the first case, the organic entity is covalently linked to POM, while in the second case, an ionic attraction occurs between the two entities. Describing this chemistry in a particular Issue would not reflect the diversity of this field as much the great diversity of these species, whether at the molecular level or at the materials level, because the great diversity of its physical properties and applications are so profound. Thus, we focus this issue only on this new field of hybrid organic inorganic compounds.

In this Issue, focusing on “Organic Inorganic Hybrids Based on Polyoxometale Compounds ”, we want to have an overview of these two classes of hybrids, from molecular species, to organometallic grafted on, to oligo-, to polymers, to nanocomposites, to liquid crystals, to micellar, to supramolecular species, and to materials like porous or mesoporous materials; their methods of characterization; and our deepened understanding of their chemical and physical properties. In addition to the design of these original architectures, we want this Issue to focus on the expected applications of these hybrid compounds, like catalytic activities, batteries, solar cells, photophysical (fluorescence, NLO, etc.), or biomedical (antiviral, anti-tumoral, IRM agents, etc.) applications.

Prof. Dr. Cédric R Mayer
Guest Editor

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• Polyoxometalate
• Hybrid organic–inorganic
• Organometallic
• Structures
• Materials
• Composites
• Applications
• Characterizations