Preparation, Structural Characterization, and Reactivity Investigation of 3d Transition Element- Substituted Metal-Oxo Clusters

By Clara Princesse

ed M-O cluster.1 They are discrete multi transition metal oxides characterized by a formidable structural variety, resulting in different dimensions, shape, charge density, surface reactivity, and rich redox chemistry. 2-7] A first classification of POMs is based on the chemical composition of these species, essentially represented by two types of general formula 8]:

Isopolyanions MaOb]p- (1)

Heteropolyanions XcMaOb]q-, with c: = a (2)

Where M is the main transition metal constituent of the POM, O is the oxygen atom, and X can be a nonmetal of the p block or a different transition metal. There are no chemical limitations for X and M by definition. The X elements are the so- called primary, central or heteroatoms. In general, any element except noble gases can participate as X in a POM cluster as there are no strict physical requirements for this position. 1] On the other hand, M is the so called secondary, peripheral or addenda atom and only some elements are typically found in such compounds. Despite the simplicity of formulae (1) and (2) above, the composition of a cluster can be highly complex, with various M elements taking part in the structure. POMs can be described as composed of MOn units, where n indicates the coordination number (n=4, 5, 6 or 7) of M. usually the distorted octahedral coordination (n=6) is observed. Most of POMs are based on edge- and corner- shared MO6 octahedra, where M is an early transition metal in its highest oxidation state (V+5, Nb+5, Ta+5, Mo+6).

• Format: Paperback
• Language: English
• ISBN: B0DPRCV27V
• ISBN13: 9798230838937
• Release Date: December 2024
• Publisher: Independent Publisher
• Length: 132 Pages
• Weight: 0.71 lbs.
• Dimensions: 0.3" x 8.5" x 11.0"