Nomenclature of Coordination Compounds: Rules and Examples
Coordination compounds contain a central metal atom or ion surrounded by ions or molecules called ligands. A systematic method is used to name these compounds according to IUPAC rules. In this article, we will learn the rules of nomenclature, ligand names, oxidation state calculation, examples, common mistakes and important MCQs. What is a Coordination Compound? A coordination compound consists of a central metal atom or ion bonded to surrounding ions or molecules called ligands. For example: [Co(NH₃)₆]Cl₃ Here: Central metal ion = Co Ligand = NH₃ Coordination number = 6 Coordination entity = [Co(NH₃)₆]³⁺ Counter ion = Cl⁻ Oxidation state of Co = +3 Important Terms in Coordination Chemistry 1. Central Metal Ion The metal atom or ion present at the centre of the coordination entity is called the central metal ion. Examples: Co, Fe, Cu, Ni, Pt and Cr. 2. Ligand A ligand is an ion or molecule that donates an electron pair to the central metal ion to form a coordinate bond. Examples: NH₃ H...