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

The objective is to determine the IUPAC name for the complex [Pt(NH₃)₂Cl₂]$^{2+}$.

1. Central Metal Ion Identification:
The central metal ion is platinum (Pt). The overall charge of the complex is +2, implying the platinum ion has a +2 charge in this context.

2. Ligand Identification:
The complex contains ammonia (NH₃) and chloride (Cl^-) ligands. Ammonia is a neutral ligand, and chloride is a monodentate anionic ligand.

3. Ligand Naming:
Ammonia is referred to as "ammine" and chloride as "chloro" in IUPAC nomenclature. The complex contains two of each ligand.

4. Platinum Oxidation State Determination:
To ascertain the oxidation state of platinum, we assign known oxidation states to the ligands. Ammonia is neutral (0), and chloride is -1. Let the oxidation state of platinum be x. The equation for the complex's total charge (+2) is:

x + 2(0) + 2(-1) = +2
Solving for x: x - 2 = +2, therefore x = +4.

5. Full Name Construction:
IUPAC nomenclature dictates naming the ligands alphabetically, followed by the central metal ion and its determined oxidation state in parentheses.

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