Explanation of the IUPAC name of [Co(NH3)6]Cl3:

Coordination Complex:
- The coordination complex [Co(NH3)6]Cl3 consists of a central cobalt ion bonded to six ammonia molecules and three chloride ions.

IUPAC Naming Convention:
- According to the IUPAC naming convention for coordination compounds, the name of the central metal ion is written first, followed by the ligands in alphabetical order.
- In this case, the central metal ion is cobalt, and the ligand is ammonia. Since "ammonia" starts with an "a," it comes before "chloride" in the alphabetical order.

Avoiding the Use of Cobaltate:
- The use of the term "cobaltate" is typically reserved for anionic complexes where cobalt has a negative oxidation state. In the case of [Co(NH3)6]Cl3, cobalt is in a neutral oxidation state, so the term "cobaltate" is not used in the IUPAC name.
- In this complex, cobalt is bonded to neutral ammonia ligands, and there is no need to indicate a specific oxidation state for cobalt in the IUPAC name.

Final IUPAC Name:
- The IUPAC name for [Co(NH3)6]Cl3 would be "hexaamminecobalt(III) chloride," where "hexaammine" indicates the presence of six ammonia ligands, "cobalt" is the central metal ion, and "(III)" denotes the +3 oxidation state of cobalt in this complex.