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Propose a structure for Co2[HC=C(C6H6)2]2(CO)6 that satisfies the 18 electron rule.

Propose a structure for Co2[HC=C(C6H6)2]2(CO)6 that satisfies the 18 electron rule.

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Answer #1

the carbonyl ligands either bridged or not donate 2 electrons. In the above example carbonyl group is taken to be bridged as in dimer of Co can have bridged carbonyl or not which is depending upon IR stretching frequency.

Since IR stretching frequency is not given in order to give a stable structure for the compound its considered to have bridged carbonyl ligand.

The compound as ever doesn't have M-M bond according to 18electron rule.

Hence to take an 18electron structure for the compound carbonyl groups are taken to be bridged.

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