Select correct statement(s) regarding `[Ni(DMG)_(2)]` complex compound

Options

A. It is extra-stabilized by hydrogen bonding
B. Its IUPAC name in bis(dimethylglyoximato)nickel(II)
C. It’s ligand contains two different donor sites.
D. Its IUPAC name in bis(dimethylglyoximato)nickelate(II)

Explanation

To analyze the complex compound `[Ni(DMG)₂]`, let's break down the statements provided and evaluate their correctness step by step.

### Step 1: Understanding the Structure of the Complex
The complex `[Ni(DMG)₂]` consists of nickel (Ni) as the central metal atom coordinated to two dimethylglyoxime (DMG) ligands. Each DMG ligand has two nitrogen donor atoms.

### Step 2: Evaluating the Statements

1. **Statement 1: It is extra-stabilized by hydrogen bonding.**
- In the structure of `[Ni(DMG)₂]`, there are hydrogen atoms attached to the oxygen atoms of the DMG ligands. These hydrogen atoms can form hydrogen bonds with the electronegative oxygen atoms. This interaction increases the stability of the complex.
- **Conclusion:** This statement is **true**.

2. **Statement 2: Its IUPAC name is bis-dimethyl-glyoxymetonickel-2.**
- The correct IUPAC naming convention for coordination compounds involves using the term "bis" for multiple ligands. The ligand DMG is known as dimethylglyoxymato. Since there are two DMG ligands, the name should be "bis-dimethylglyoxymato". The central metal is nickel, and since the complex is neutral, we do not add the suffix "ate".
- **Conclusion:** This statement is **false** because the correct name does not include "glyoxymetonickel-2".

3. **Statement 3: Its ligand contains two different donor sites.**
- Each DMG ligand has two nitrogen atoms as donor sites, but they are not different; they are the same type of donor atoms (both are nitrogen).
- **Conclusion:** This statement is **false**.

4. **Statement 4: Its IUPAC name is bis-dimethyl-glyoxymatonickelate-2.**
- As previously discussed, the correct IUPAC name does not include the suffix "ate" because the complex is neutral. Therefore, the name should not include "nickelate".
- **Conclusion:** This statement is **false**.

### Final Evaluation
Based on the analysis:
- **Correct Statements:** Only Statement 1 is true.
- **Incorrect Statements:** Statements 2, 3, and 4 are false.

### Summary of Correct Statements
- The only correct statement regarding the `[Ni(DMG)₂]` complex is that it is extra-stabilized by hydrogen bonding.