In: Chemistry
What is the formal name for each of the following coordination compounds? a. [Co(H2O)3(NH3)3](NO3)3 b. Na3[FeF6] c. [Mn(en)2Br2]Cl2 d. Ba[Sn(OH)4]
a. [Co(H2O)3(NH3)3](NO3)3-triamminetriaquacobalt(III) nitrate.
=> The complex ion is found inside the parentheses. In this case, the complex ion is a cation. ·
=> The ammine ligands are named first because alphabetically, “ammine” comes before “aqua.” ·
=> The compound is electrically neutral and thus has an overall charge of zero.
=> Since there are three nitrates associated with one complex ion and each nitrate has a –1 charge, the charge on the complex ion must be +3. ·
=> From the charge on the complex ion and the charge on the ligands, we can calculate the oxidation number of the metal. In this example, all the ligands are neutral molecules.
=> Therefore, the oxidation number of cobalt must be the same as the charge of the complex ion, +3.
b) Na3[FeF6]-sodium hexafluoroferrate(III).
=> Sodiumis the cation, and the complex ion is the anion. ·
=> Since there are 3Na+ associated with the complex ion (each Na+ having a +1 charge), the charge on the complex ion must be -3. · Since each ligand carries –1 charge, the oxidation number of Fe must be +3.
c) [Mn(en)2Br2]Cl2-dibromobis(ethylenediamine)manganese(IV) chloride.
=>Since Ethylenediamine is a bidentate ligand, the prefix bis- is used instead of the prefix di-.
d) Ba[Sn(OH)4]- barium tetraaquotin(II).