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How does the metal carbonyls gains stabi...

How does the metal carbonyls gains stability although CO. is a weak donor?

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Carbon monoxide, .CO. as a ligand binds itself to metal atoms through the carbon atoms. It is a weak donor and a weak base. It forms a weak .sigma. bond to the central atom, .CO., is also an acceptor ligand and forms ạ pi bond to the metal. This characteristic property of back bonding. stabilises the metal ligand interaction.
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