The polyhedral symbol indicates the geometrical arrangements of the coordinating atoms about the central atom . It consists of one or more capital italic letters derived from common geometric terms (tetrahedron, square plane, octahedron, etc.) which denote the idealized geometry of the ligands around the coordination center, and an arabic numeral that is the coordination number of the central atom . The polyhedral symbol is used as an affix, enclosed in parentheses, and separated from the name by a hyphen. Examples are T-4, SP-4, TBPY-5, SPY-5, OC-6, andCU-8.
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