Question

The correct IUPAC name of [Pt(NH$_3$)$_2$Cl$_2$]$^{2+} $ is:

• A. Diamminedichloridoplatinate (IV)
• B. Diamminedichloridoplatinum (IV)
• C. Diamminedichloridoplatinum (O)
• D. Diamminedichloridoplatinum (II)

Hint:

When naming coordination compounds, ensure the oxidation state of the metal and the ligands are correctly identified.

Answer 1

The Correct Option is A

To solve the problem, we need to determine the correct IUPAC name of the complex [Pt(NH₃)₂Cl₂]$^{2+}$.

1. Identifying the Central Metal Ion:
The central metal ion in the complex is platinum (Pt), which has a charge of +2, as indicated by the overall charge of the complex being +2.

2. Identifying the Ligands:
The ligands present in the complex are ammonia (NH₃) and chloride (Cl^-). Ammonia is a neutral ligand, and chloride is a monodentate anionic ligand.

3. Naming the Ligands:
The ligand ammonia is named "ammine," and chloride is named "chloro." There are two of each ligand in the complex.

4. Determining the Oxidation State of Platinum:
To determine the oxidation state of platinum, we assign oxidation states to the ligands. Ammonia is neutral, and chloride has a charge of -1. Let the oxidation state of platinum be x. The total charge of the complex is +2, so we have the equation:

x + 2(-1) = +2
Solving for x: x - 2 = +2, so x = +4.

5. Writing the Full Name:
According to the IUPAC nomenclature, the complex is named by first naming the ligands in alphabetical order, followed by the central metal ion with its oxidation state in parentheses.

Final Answer:
The correct IUPAC name of [Pt(NH₃)₂Cl₂]$^{2+}$ is "diamminedichloroplatinum(IV) ion."