1Chapter 24Coordination Compounds1Complexes•A central metal atom bonded to a group of molecules orto a group of molecules or ions is ametal complex.•If the complex bears a charge, it is acomplex ion.•Compounds containing complexes arecoordinationcoordination compounds.2Complexes•The molecules or ions coordinating to the t lthlidmetal are theligands.•They are usually anions or polar molecules.•They must contain lone pairs.3Coordination Compounds•Many coordination compounds are brightly colored.•Different coordination compounds from the same metal and ligands can give quite different numbers of ions when they dissolve.4
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2Coordination Compounds•The central metal and the ligands directly bonded to it make up thecoordination sphereof the complexcomplex.5Coordination CompoundsAll molecules and ions within the sphere are put in brackets. Those “free” ions (that dissociate from the complex ion when dissolved in water) are put outside the brackets.6Coordination Compound7Metal-Ligand Bond•The bond is formed when the ligand donates both electrons to be shared by the ligand andboth electrons to be shared by the ligand and the metal.The ligands have nonbonding electrons.The metal has empty orbitals.•The bond is called coordinate covalent bond.8