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 in the nickel-DMG complex, we can follow these steps:

### Step 1: Identify the Ligand
First, we need to identify the ligand involved in the complex. In this case, the ligand is DMG (Dimethylglyoxime).

### Step 2: Understand the Structure of DMG
The structure of DMG is CH3C(=NOH)C(=NOH)CH3. Each DMG molecule has two nitrogen atoms that can donate lone pairs to the central metal atom (nickel).

### Step 3: Count the Number of DMG Ligands
In the nickel-DMG complex, there are two DMG ligands present.

### Step 4: Determine the Number of Donor Atoms
Each DMG ligand has two donor atoms (the nitrogen atoms). Therefore, if there are two DMG ligands, the total number of donor atoms is:
- 2 DMG ligands × 2 donor atoms per DMG = 4 donor atoms.

### Step 5: Define Coordination Number
The coordination number is defined as the number of donor atoms that are directly bonded to the central metal atom.

### Step 6: Conclusion
Since there are 4 donor atoms from the two DMG ligands attached to the nickel, the coordination number of nickel in the nickel-DMG complex is 4.

### Final Answer
The coordination number of Ni in the nickel-DMG complex is **4**.

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