Question

What type of Fe-Fe bodn is present (i.e. single, double, triple, etc)? [(η5-C5H5)Fe(CO)2]2

What type of Fe-Fe bodn is present (i.e. single, double, triple, etc)?

[(η5-C5H5)Fe(CO)2]2

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Answer #1

Theortically speaking there should not be any bond between Fe-Fe atoms.

The above structures satifies the 18 electron rule each electron count method cyclopentadienyl = 5; CO = 2; bridging CO = 2

So 2cyclopentadienyl = 2x5 = 10

    2 terminal CO = 2x2 = 4

2 bridging CO = 2X2 = 4

2Fe = 2x8 = 16

So total electron count is 10+4+4+16 = 34

then for two metals = 34/2 = 17

therefore, one single bond should be there between Fe-Fe atoms

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