Octahedral 21 Molecular Geometry

**Semantic type:** Spatial Concept

**Definition:** Octahedral molecular geometry where the Cahn-Ingold-Prelog (CIP) priority of the lowest priority donor atom directly across from (trans to) a priority 1 donor atom is 2 and the priority of the donor atom across from (trans to) the highest priority atom in the plane perpendicular to this reference axis is 1.

**Synonyms:** - OC-6-21 - OCTAHEDRAL 21 - cis-octahedral - fac-octahedral