Question:medium
The number of bridging carbonyl groups in $[Mn_2(CO)_{10}]$ is
The number of bridging carbonyl groups in $[Mn_2(CO)_{10}]$ is
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$[Co_2(CO)_8]$ has bridging CO, but $[Mn_2(CO)_{10}]$ does not.
Updated On: May 10, 2026
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
This question asks about the structure of a specific metal carbonyl complex, dimanganese decacarbonyl, [Mn\(_2\)(CO)\(_{10}\)]. We need to know whether the CO ligands are terminal (bonded to only one metal atom) or bridging (bonded to both metal atoms).
Step 2: Detailed Explanation:
The structure of [Mn\(_2\)(CO)\(_{10}\)] is a well-known example in organometallic chemistry. - The structure consists of two Mn atoms joined by a direct metal-metal (Mn-Mn) bond. - Each manganese atom is bonded to five terminal CO groups in an approximately octahedral geometry (if we consider the other Mn atom as one of the ligands). - The two Mn(CO)\(_5\) units are staggered with respect to each other to minimize steric hindrance. - Crucially, there are no bridging carbonyl groups. All ten CO ligands are terminal. The structure can be visualized as (CO)\(_5\)Mn-Mn(CO)\(_5\). Other common metal carbonyls like Fe\(_2\)(CO)\(_9\) and Co\(_2\)(CO)\(_8\) (in solid state) do have bridging carbonyls, but [Mn\(_2\)(CO)\(_{10}\)] does not. The presence of a direct metal-metal bond satisfies the 18-electron rule for each metal center without the need for bridging ligands.
Step 3: Final Answer:
The number of bridging carbonyl groups in [Mn\(_2\)(CO)\(_{10}\)] is 0.
This question asks about the structure of a specific metal carbonyl complex, dimanganese decacarbonyl, [Mn\(_2\)(CO)\(_{10}\)]. We need to know whether the CO ligands are terminal (bonded to only one metal atom) or bridging (bonded to both metal atoms).
Step 2: Detailed Explanation:
The structure of [Mn\(_2\)(CO)\(_{10}\)] is a well-known example in organometallic chemistry. - The structure consists of two Mn atoms joined by a direct metal-metal (Mn-Mn) bond. - Each manganese atom is bonded to five terminal CO groups in an approximately octahedral geometry (if we consider the other Mn atom as one of the ligands). - The two Mn(CO)\(_5\) units are staggered with respect to each other to minimize steric hindrance. - Crucially, there are no bridging carbonyl groups. All ten CO ligands are terminal. The structure can be visualized as (CO)\(_5\)Mn-Mn(CO)\(_5\). Other common metal carbonyls like Fe\(_2\)(CO)\(_9\) and Co\(_2\)(CO)\(_8\) (in solid state) do have bridging carbonyls, but [Mn\(_2\)(CO)\(_{10}\)] does not. The presence of a direct metal-metal bond satisfies the 18-electron rule for each metal center without the need for bridging ligands.
Step 3: Final Answer:
The number of bridging carbonyl groups in [Mn\(_2\)(CO)\(_{10}\)] is 0.
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