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 can follow these steps:

### Step 1: Identify the Central Metal Atom and Its Oxidation State
- The central metal atom in the complex is Platinum (Pt).
- To find the oxidation state of Platinum, we can set up the equation based on the charges of the ligands and the overall charge of the complex.
- The complex has one chloride ion (Cl⁻) outside the coordination sphere, which contributes -1 to the overall charge.

### Calculation:
Let the oxidation state of Pt be \(x\).
- Ammonia (NH₃) is a neutral ligand, contributing 0.
- Chloride (Cl) contributes -1.
- Methylamine (NH₂CH₃) is also a neutral ligand, contributing 0.

The equation can be set up as:
\[ x + 0 + 0 - 1 = 0 \quad \text{(since the overall charge of the complex is neutral)} \]
This simplifies to:
\[ x - 1 = 0 \implies x = +1 \]
However, since we have a chloride ion outside the coordination sphere, we need to consider it when naming:
\[ x + 2(0) + (-1) = +1 \implies x = +2 \]
Thus, the oxidation state of Platinum is +2.

### Step 2: Identify the Ligands and Their Names
- The ligands present in the complex are:
- Two ammonia (NH₃) ligands, which are named "ammine."
- One chloride (Cl) ligand, which is named "chloro."
- One methylamine (NH₂CH₃) ligand, which is named "methanamine."

### Step 3: Arrange the Ligands in Alphabetical Order
When naming the ligands, we must arrange them in alphabetical order, ignoring any prefixes (di-, tri-, etc.):
- "ammine" (from NH₃)
- "chloro" (from Cl)
- "methanamine" (from NH₂CH₃)

The order will be:
1. chloro
2. ammine
3. methanamine

### Step 4: Construct the Name of the Complex
- Since there are two ammine ligands, we use the prefix "di-".
- The name will be constructed as follows:
- "diammine" for the two NH₃ ligands
- "chloro" for the Cl ligand
- "methanamine" for the NH₂CH₃ ligand
- Finally, we add the name of the metal (Platinum) and its oxidation state in Roman numerals.

The complete name of the complex will be:
**Dichloro-diammine-methanamine-platinum(II) chloride.**

### Final Answer
The IUPAC name of the complex \([Pt(NH_3)_2Cl(NH_2CH_3)]Cl\) is **Dichloro-diammine-methanamine-platinum(II) chloride.**

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