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A central metal atom bonded to a group of molecules or ions is a metal complex. • If it’s charged, it’s a complex ion. Chemistry • Compounds containing complexes are coordination of Coordination Compounds compounds.The molecules or ions coordinating to the metal are the ligands. | Complexes A central metal atom bonded to a group of molecules or ions is a metal complex. If it s charged it s a complex ion. Compounds containing complexes are coordination compounds. Compounds Complexes The molecules or ions coordinating to the metal are the ligands. They are usually anions or polar molecules. The must have lone pairs to interact with metal Compounds A chemical mystery Same metal same ligands different number of ions when dissolved TABLE 24.1 Properties of Some Ammonia Complexes of Cobalt III Original Ions per Free Cl Ions Modern Formulation Color Formula Unit per Formula Unit Formulation CoC13-6 NH3 Orange 4 3 Co NH3 6 C13 CoC13-5 NH3 Purple 3 2 Co NH3 5C1 C12 CoC13-4 NH3 Green 2 1 frans- Co NH3 4Cl2 Cl CoC13-4 NH3 Violet 2 1 cis- Co NH3 4Cl2 Cl Many coordination compounds are brightly colored but again same metal same ligands different colors. Chemistry of Coordination .
