IUPAC name of `[Pt(NH_(3))_(3) (NO)Cl_2] Br` is

Answer

To determine the IUPAC name of the coordination compound \([Pt(NH_3)_3(NO)Cl_2]Br\), we will follow the systematic naming rules for coordination complexes. Here’s a step-by-step breakdown of the process:

### Step 1: Identify the ligands and their counts
- The ligands present in the complex are:
- Amine (NH₃): 3 molecules
- Nitrosyl (NO): 1 molecule
- Chloro (Cl): 2 molecules
- The bromine (Br) is a counter ion.

### Step 2: Determine the oxidation state of the central metal
- Let the oxidation state of platinum (Pt) be \(X\).
- The charges of the ligands are as follows:
- NH₃ is neutral (0 charge)
- NO (as nitrosyl) has a +1 charge
- Cl has a -1 charge
- The overall charge of the complex ion must be neutral (0).

The equation for the oxidation state can be set up as:
\[ X + (3 \times 0) + (+1) + (2 \times -1) = 0 \]
This simplifies to:
\[ X + 1 - 2 = 0 \implies X - 1 = 0 \implies X = +1 \]
So, the oxidation state of platinum is +2.

### Step 3: Name the ligands in alphabetical order
- The ligands are named in alphabetical order regardless of their charge:
- Amine (NH₃) is named as "triamine" (since there are 3 of them).
- Chloro (Cl) is named as "dichlorido" (since there are 2 of them).
- Nitrosyl (NO) is named as "nitrosonium".

### Step 4: Combine the names and add the oxidation state
- The name of the complex cation is formed by combining the ligand names followed by the name of the metal with its oxidation state in Roman numerals.
- The name for the cation part is:
- "triamine" + "dichlorido" + "nitrosonium" + "platinum(II)"

### Step 5: Add the counter ion
- The counter ion (Br) is named as "bromide".

### Final IUPAC Name
Putting it all together, the complete IUPAC name of the compound \([Pt(NH_3)_3(NO)Cl_2]Br\) is:
**Triamine dichlorido nitrosonium platinum(II) bromide.**