Number of bridging CO ligands in is

Question

Number of bridging CO ligands in  is

Canvas Classes · Accepted Answer

Strategy:
 Simply recall the structural connectivity of .

Step 1: Structural features of 
Unlike some dimeric carbonyls (like  or ),  features precisely one direct metal-to-metal (Mn-Mn) covalent bond linking two staggered  square pyramidal halves.
There are no carbonyl ligands spanning between both metal centers.

Step 2: Conclusion
Number of bridging  ligands = 0.

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