Coordination geometry

The term coordination geometry is used in a number of related fields of chemistry as well as solid state chemistry/physics.

Naming of inorganic compounds

IUPAC pretend introduced the polyhedral symbol as factor of their IUPAC nomenclature of inorganic chemistry 2005 recommendations to describe the geometry around an atom in a compound. IUCr gain proposed a symbol which is shown as a superscript in square brackets in the chemical formula. For example, CaF₂ would be Ca^{[8cb]F₂[4t], where [8cb] means cubic coordination and [4t] means tetrahedral. The equivalent symbols in IUPAC are CU−8 and T−4 respectively. The IUPAC symbol is applicable to complexes and molecules whereas the IUCr proposal applies to crystalline solids.}