The IUPAC name of the complex `[Pt (NH_3)_2Cl(NH_2CH_3)] Cl` is

Options

A. Diamminechlorido (aminomethane) platinum (II) chloride
B. Diammine (methanamine) chloridoplatinum (II) chloride
C. Diamminechlorido (methanamine) platinum (II) chloride
D. Bisammine (methanamine) chloridoplatinum (II) chloride

Answer

To determine the IUPAC name of the complex \([Pt(NH_3)_2Cl(NH_2CH_3)]Cl\), we will follow the systematic naming rules for coordination compounds. Here’s a step-by-step breakdown of the process:

### Step 1: Identify the Cation and Anion
The complex consists of a cation and an anion. The cation is \([Pt(NH_3)_2Cl(NH_2CH_3)]^+\) and the anion is \(Cl^-\).

### Step 2: Name the Ligands
1. **Ammonia Ligands**: The ligand \(NH_3\) is called "ammine". Since there are two of them, we use the prefix "di", resulting in "diammine".
2. **Chloride Ligand**: The ligand \(Cl^-\) is called "chlorido".
3. **Methanamine Ligand**: The ligand \(NH_2CH_3\) is called "methanamine".

### Step 3: Arrange the Ligands Alphabetically
When naming the ligands, we arrange them in alphabetical order, ignoring any prefixes (di-, tri-, etc.):
- "ammine" (from diammine)
- "chlorido"
- "methanamine"

Thus, the order will be: diammine, chlorido, methanamine.

### Step 4: Name the Metal and Determine its Oxidation State
The metal in the complex is platinum (Pt). To find its oxidation state, we can set up the equation based on the charges:
- The total charge of the cation must equal the charge of the anion.
- The charges from the ligands are:
- Each \(NH_3\) is neutral (0 charge).
- \(Cl\) contributes -1.
- \(NH_2CH_3\) is neutral (0 charge).

Let \(x\) be the oxidation state of platinum:
\[ x + 2(0) + (-1) + 0 = +1 \quad (since the overall charge of the cation is +1) \]
This simplifies to:
\[ x - 1 = 1 \implies x = +2 \]
Thus, the oxidation state of platinum is +2.

### Step 5: Combine the Names
Now we can combine the names in the order of ligands followed by the metal and its oxidation state:
- Ligands: diammine, chlorido, methanamine
- Metal: platinum(II)

### Step 6: Add the Anion
Finally, we add the name of the anion, which is "chloride".

### Final IUPAC Name
Putting it all together, the IUPAC name of the complex \([Pt(NH_3)_2Cl(NH_2CH_3)]Cl\) is:
**diammine chlorido methanamine platinum(II) chloride**.

---