coordination entity 

https://doi.org/10.1351/goldbook.C01330
An assembly consisting of a central atom (usually metallic) to which is attached a surrounding array of other groups of atoms (ligands).
Source:
Red Book, 3rd ed., p. 145 [Terms] [Book]
Citation: 'coordination entity' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.C01330 RIS BibTex EndNote
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Last revised: February 24, 2014