What is the coordination number of Ni in nickel DMG complex?

Options

A. 2
B. 3
C. 6
D. 4

Answer

To determine the coordination number of nickel (Ni) in the nickel-DMG (dimethylglyoxime) complex, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Ligand**:
- DMG (dimethylglyoxime) is a bidentate ligand. This means that each DMG molecule can form two bonds with the central metal atom (Ni in this case).

2. **Count the Number of DMG Ligands**:
- In the nickel-DMG complex, there are two DMG ligands present.

3. **Calculate the Total Coordination**:
- Since each DMG ligand can attach through two donor atoms, the total number of donor atoms from the two DMG ligands is:
\[ \text{Total donor atoms} = 2 \, (\text{from one DMG}) \times 2 \, (\text{number of DMG ligands}) = 4 \]

4. **Determine the Coordination Number**:
- The coordination number is defined as the number of nearest neighbor atoms (or donor atoms) that are bonded to the central metal atom. In this case, since there are four donor atoms from the two DMG ligands, the coordination number of Ni in the nickel-DMG complex is:
\[ \text{Coordination number of Ni} = 4 \]

5. **Conclusion**:
- Therefore, the coordination number of nickel (Ni) in the nickel-DMG complex is **4**.