What is POM in chemistry?
In chemistry, a polyoxometalate (abbreviated POM) is a polyatomic ion, usually an anion, that consists of three or more transition metal oxyanions linked together by shared oxygen atoms to form closed 3-dimensional frameworks.
How are polyoxometalates made?
Polyoxometalates are large metal cluster anions formed mainly by transition metals and oxygen atoms that can adopt a variety of spatial structures [146].
What are polyoxometalates used for?
Polyoxometalates (POM) have been well-known as active catalysts for the oxidation of organic compounds with hydrogen peroxide in both heterogeneous and homogeneous systems [1-3].
What is a Keggin ion?
Keggin structure is the best known structural form for heteropoly acids. It is the structural form of α-Keggin anions, which have a general formula of [XM12O40]n−, where X is the heteroatom (most commonly are P5+, Si4+, or B3+), M is the addendum atom (most common are molybdenum and tungsten), and O represents oxygen.
What is a Keplerate?
Keplerates are high symmetry polymetallic molecules that contain metal polyhedra that describe both Platonic and Archimedean solids, one inside the other, in a manner akin to Russian dolls.
What is Isopoly and heteropoly acids?
In other words, isopoly acids contain only one metal along with hydrogen and oxygen while heteropoly acids contain two elements other than hydrogen and oxygen. The corresponding salts of isopoly and heteropoly acids are called as isopoly and heteropoly salts, respectively.
What are Isopoly and heteropoly anions?
The key difference between isopoly and heteropoly acids is that isopoly acids form from the combination of similar acids or anions whereas heteropoly acids form from the combination of different acids or anions. Therefore, isopoly acids have the same repeating unit but heteropoly acids have different repeating units.
What is Isopoly?
Definition of isopoly acid : any of a large group of complex oxygen-containing acids derived from a single inorganic acid by elimination of water from two or more molecules —distinguished from heteropoly acid.
What is Isopoly and heteropoly anions?
What is heteropoly anion?
Heteropoly anions can be regarded as coordination compounds with polyanion ligands; e.g., [(H3N)5Cr(OH2)]3+ can be considered the parent of [(SiW11O39)Cr(OH2)]5−. A variety of synthetic procedures are available for the preparation of isopoly acids and salts, which are usually less stable than heteropoly compounds.
What is Isopolyacids?
What is Isopoly and heteropoly?
