The voltage the characteristics is not common between `[Cu(en)_(2)]^(2+) and [Ni(dmg)_(2)]`?

Options

A. Geometry of complexes
B. Hybridisation of central metal cation
C. Magnetic behaviour
D. Number of stereoisomers

Answer

To solve the question regarding the voltage characteristics that are not common between the complexes \([Cu(en)_2]^{2+}\) and \([Ni(dmg)_2]\), we will analyze the properties of each complex step by step.

### Step 1: Determine the oxidation states and electronic configurations
1. **Copper Complex \([Cu(en)_2]^{2+}\)**:
- Copper (Cu) is in the +2 oxidation state.
- The electronic configuration of Cu is \([Ar] 3d^{10} 4s^1\). In the +2 state, it loses two electrons, resulting in \(3d^9\).

2. **Nickel Complex \([Ni(dmg)_2]\)**:
- Nickel (Ni) is also in the +2 oxidation state.
- The electronic configuration of Ni is \([Ar] 3d^{8} 4s^2\). In the +2 state, it loses two electrons, resulting in \(3d^8\).

### Step 2: Identify the ligand field strength and hybridization
1. **For \([Cu(en)_2]^{2+}\)**:
- Ethylenediamine (en) is a strong field ligand, which causes pairing of electrons.
- The hybridization is \(dsp^2\) leading to a square planar geometry.

2. **For \([Ni(dmg)_2]\)**:
- Dimethylglyoxime (dmg) is also a strong field ligand.
- The hybridization is also \(dsp^2\) leading to a square planar geometry.

### Step 3: Analyze the magnetic properties
1. **Magnetic Behavior**:
- \([Cu(en)_2]^{2+}\): With \(3d^9\) configuration, it has one unpaired electron, making it **paramagnetic**.
- \([Ni(dmg)_2]\): With \(3d^8\) configuration, it has all electrons paired, making it **diamagnetic**.

### Step 4: Determine the stereoisomer count
1. **Stereoisomers**:
- Both complexes are square planar and do not have geometrical or optical isomers, leading to **zero stereoisomers** for both.

### Conclusion
From the analysis:
- The common characteristics between \([Cu(en)_2]^{2+}\) and \([Ni(dmg)_2]\) include:
- Geometry: Square planar
- Hybridization: \(dsp^2\)
- Number of stereoisomers: Zero

The characteristic that is **not common** is the **magnetic behavior**:
- \([Cu(en)_2]^{2+}\) is paramagnetic.
- \([Ni(dmg)_2]\) is diamagnetic.

Thus, the answer is **C: Magnetic behavior**.