Keggin Isomers

This post introduced my understanding of Keggin structure. Keggin structure, also called Baker-Figgis-Keggin structure, is a well known structrual scalfold for heteropoly acids and other inorganic compounds. Below is extracted from the structure [AlO4Al12(OH)24(H2O)12]7+ (often called as Al13) determined by the X-ray crystallograph.

Al13, &epsilon Keggin Structure


α Isomer, Td

α Isomer, Wireframe Model



&epsilon Isomer, Td

&epsilon Isomer, Wireframe Model



&beta Isomer, C3v


&gramma Isomer, C2v


&delta Isomer, C3v