Chemistry, The Central Science , 10th edition Theodore L. Brown; H. Eugene LeMay, Jr.; and Bruce E. Bursten. Chapter 24 Chemistry of Coordination Compounds. John D. Bookstaver St. Charles Community College St. Peters, MO 2006, Prentice Hall, Inc. Complexes.
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In CoCl3 ∙5 NH3 the five NH3 groups and one chlorine are bonded to the cobalt, and the other two chloride ions are outside the sphere.
Werner proposed putting all molecules and ions within the sphere in brackets and those “free” anions (that dissociate from the complex ion when dissolved in water) outside the brackets.
The coordination of the ligand with the metal can greatly alter its physical properties, such as color, or chemical properties, such as ease of oxidation.
Knowing the charge on a complex ion and the charge on each ligand, one can determine the oxidation number for the metal.