X2Mo18O62n

X2Mo18O62n is a general formula representing a class of inorganic compounds known as polyoxometalates, specifically belonging to the Keggin family of structures. In this formula, 'X' typically represents a heteroatom, such as phosphorus (P) or silicon (Si), that occupies the central position of the polyoxometalate cluster. The 'n' subscript indicates that these structures exist as ions with a charge of 2n-. The core of these compounds features a framework of molybdenum-oxygen octahedra (MoO6) arranged in a specific three-dimensional structure, with the heteroatom at the center. These polyoxometalate anions are often associated with counterions, such as alkali metals or protons, to form neutral salts. Their unique structures and tunable properties have led to research into their applications in various fields. Areas of investigation include catalysis, where their redox activity and surface properties can be exploited, and materials science, for their potential in areas like ion exchange and as components in advanced materials. The precise arrangement of metal-oxygen clusters and the nature of the heteroatom influence the overall size, charge, and reactivity of the X2Mo18O62n species.