what is the name of this coordination compound [CoSO4(NH3)5]Br?
pentaamminesulfatocobalt (III) bromide
http://seattlecentral.edu/faculty/dwick/CC%20name.pdf
1L is the one, NH3 and SO4 reversed
Well, it appears that the name of this coordination compound is a bit of a tongue twister. Let's break it down, shall we?
The central atom is cobalt (Co), accompanied by sulfate (SO4). Surrounding them are five ammonia (NH3) ligands. And to top it all off, there's a bromide (Br) ion.
So, drumroll please... the name of this delightful compound is pentammineaquasulfatocobalt(II) bromide! Phew, that's a mouthful, isn't it?
To determine the name of the given coordination compound, we will break it down into three parts: the central metal ion, the ligands, and the overall charge on the complex.
1. Central Metal Ion:
The central metal ion in this compound is cobalt (Co).
2. Ligands:
The ligands are the surrounding atoms or molecules that bind to the central metal ion. In this compound, there are two types of ligands: sulfate (SO4) and ammonia (NH3).
The sulfate ligand is coordinated with the cobalt ion through one of its oxygen atoms.
The ammonia ligand is coordinated with the cobalt ion through its nitrogen atom.
3. Overall Charge:
The overall charge on the complex can be determined by considering the charge of the ligands and the charge of the counterion. In this case, the counterion is bromide (Br).
The sulfate ligand (SO4) has a charge of -2. There are two of them, so the total charge from sulfate is -4.
The ammonia ligand (NH3) is neutral; it does not contribute any charge to the complex.
Since the compound is labeled as [CoSO4(NH3)5]Br, it means there is a bromide counterion, which carries a charge of -1.
Adding up the charges:
Overall charge = Charge from ligands + Charge from counterion
Overall charge = -4 + (-1)
Overall charge = -5
Based on the information above, we can name the compound as follows:
[CoSO4(NH3)5]Br is called "pentaammine(sulfato)cobalt(III) bromide."
To determine the name of this coordination compound, you need to follow certain rules and conventions of chemical nomenclature. Here's a step-by-step guide:
1. Identify the central metal atom/ion: In this case, the metal ion is cobalt (Co).
2. Determine the oxidation state of the central metal ion: The sulfate ion (SO4) has a charge of -2, and there are six ammonia (NH3) ligands and one bromide ion (Br). Since these species are negatively charged, we can add up their charges to find the oxidation state of cobalt:
-2 (from SO4) + 0 (from NH3) x 6 + 1 (from Br) = -2 + 0 + 1 = -1
Therefore, cobalt (Co) has an oxidation state of +3.
3. Write the name of the ligands in alphabetical order: The ligands in this coordination compound are ammonia (NH3) and sulfate (SO4). Ammonia starts with "A," and sulfate starts with "S"; therefore, ammonia comes first.
4. Specify the number of ligands: In this case, ammonia has a coefficient of 5, which means there are five ammonia ligands.
5. Write the name of the central metal ion: The name of the metal ion is cobalt.
Putting everything together following these steps, the name of the coordination compound [CoSO4(NH3)5]Br is pentammineaquacobalt(III) sulfate bromide.