The IUPAC name of complex `[Cu(en)_(2)(H_(2)O)_(2)]^(2+)`

Options

A. ethylene dimineCu(II) dihydrate
B. diaquobis(ethylenediamine)copper(II)ion
C. diaquobisdietyleamineCU(II)ion
D. diaquobis(ethylenediamine)cuprate(II)

Answer

To determine the IUPAC name of the complex \([Cu(en)_{2}(H_{2}O)_{2}]^{2+}\), we will follow these steps:

### Step 1: Determine the oxidation state of the central metal ion (Cu)
Let the oxidation state of copper (Cu) be \(x\). The ligands ethylene diamine (en) and water (H2O) are both neutral ligands, contributing 0 to the overall charge. The overall charge of the complex is \(+2\).

Thus, we can set up the equation:
\[ x + 0 + 0 = +2 \]
This simplifies to:
\[ x = +2 \]

### Step 2: Identify and name the ligands
The complex contains two types of ligands:
1. Ethylene diamine (en) - a bidentate ligand
2. Water (H2O) - a neutral ligand

In coordination chemistry, water is referred to as "aqua".

### Step 3: Count the number of each type of ligand
- There are 2 ethylene diamine ligands, which will be named as "bis" ethylene diamine.
- There are 2 water ligands, which will be named as "di aqua".

### Step 4: Arrange the ligands in alphabetical order
When naming coordination compounds, ligands are listed in alphabetical order regardless of their quantity. The order is:
- Aqua (A)
- Ethylene diamine (E)

Thus, the order will be:
1. Di aqua
2. Bis ethylene diamine

### Step 5: Name the central metal ion with its oxidation state
The central metal ion is copper, and since we determined its oxidation state to be +2, we will denote it as "copper(II)".

### Step 6: Combine all parts to form the complete name
Putting it all together, the IUPAC name of the complex \([Cu(en)_{2}(H_{2}O)_{2}]^{2+}\) is:
**Di aqua bis ethylene diamine copper(II)**.

### Final Answer:
**Di aqua bis ethylene diamine copper(II)**

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