Which metal center does not obey the 18-electron rule? a. Fe in Fe(n5-C5H4COME)2 b. Co in Co2(CO)8 (single metal-metal bond) C. Ru in [Ru(n6-C6ME6)2]2+ d. V in V(CO)6

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### QUESTION 2

Which metal center does not obey the 18-electron rule?

- [ ] a. Fe in Fe(η⁵-C₅H₄COMe)₂
- [ ] b. Co in Co₂(CO)₈ (single metal-metal bond)
- [ ] c. Ru in [Ru(η⁶-C₆Me₆)₂]²⁺
- [ ] d. V in V(CO)₆

This question relates to the concept of the 18-electron rule, which is commonly used for predicting the stability of metal complexes, particularly in organometallic chemistry. Here, you need to identify which of these metal centers does not conform to the 18-electron rule.

**Explanation of Complex Notations:**
1. **Fe in Fe(η⁵-C₅H₄COMe)₂:** This notation describes an iron center coordinated by two η⁵-cyclopentadienyl anions, each substituted with a COMe group.
2. **Co in Co₂(CO)₈ (single metal-metal bond):** This complex involves two cobalt atoms bridged by a single metal-metal bond and a total of eight carbonyl (CO) ligands.
3. **Ru in [Ru(η⁶-C₆Me₆)₂]²⁺:** This describes a ruthenium ion coordinated by two η⁶-benzene ligands fully substituted by methyl groups, carrying a 2+ charge.
4. **V in V(CO)₆:** This notation describes a vanadium center surrounded by six carbonyl ligands.
Transcribed Image Text:### QUESTION 2 Which metal center does not obey the 18-electron rule? - [ ] a. Fe in Fe(η⁵-C₅H₄COMe)₂ - [ ] b. Co in Co₂(CO)₈ (single metal-metal bond) - [ ] c. Ru in [Ru(η⁶-C₆Me₆)₂]²⁺ - [ ] d. V in V(CO)₆ This question relates to the concept of the 18-electron rule, which is commonly used for predicting the stability of metal complexes, particularly in organometallic chemistry. Here, you need to identify which of these metal centers does not conform to the 18-electron rule. **Explanation of Complex Notations:** 1. **Fe in Fe(η⁵-C₅H₄COMe)₂:** This notation describes an iron center coordinated by two η⁵-cyclopentadienyl anions, each substituted with a COMe group. 2. **Co in Co₂(CO)₈ (single metal-metal bond):** This complex involves two cobalt atoms bridged by a single metal-metal bond and a total of eight carbonyl (CO) ligands. 3. **Ru in [Ru(η⁶-C₆Me₆)₂]²⁺:** This describes a ruthenium ion coordinated by two η⁶-benzene ligands fully substituted by methyl groups, carrying a 2+ charge. 4. **V in V(CO)₆:** This notation describes a vanadium center surrounded by six carbonyl ligands.
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