Name this compound:
[Co(NH3)5Cl]Cl2
Try pentaaminechlorocobalt(III) chloride
pentaamMinechlorocobalt(III) chloride
(Two M's)
The compound you mentioned is called pentaamminechloridocobalt(III) chloride, or simply cobalt(III) chloride pentaamminechloride.
To name this compound, we need to break it down and understand its components. In this compound, we have a cobalt ion (Co) that is coordinated with five ammonia molecules (NH3) and one chloride ion (Cl). Additionally, there are two chloride ions (Cl) outside the coordination sphere.
Let's start with the inner part of the complex, which is [Co(NH3)5Cl]. The name for this complex can be determined by considering the coordination number of the metal ion (Co) and the ligands (NH3 and Cl). In this case, the cobalt ion has a coordination number of 6 since it is bonded to five ammonia molecules and one chloride ion. Since the chloride ion is named after its elemental form, we write it as "chlorido."
Now, let's focus on the outer part of the complex, which is the two chloride ions (Cl) outside the coordination sphere. These are named as chloride since they are negatively charged ions.
Putting it all together, we get the name "pentaamminechloridocobalt(III) chloride." The "pentaammine" part represents the five ammonia ligands, "chlorido" represents the chloride ion within the coordination sphere, and "cobalt(III) chloride" indicates the oxidation state of the cobalt ion and the presence of the additional chloride ions outside the coordination sphere.