What do you mean by synergic effect in metal carbonyl complexes?

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The M−C π-bond in metal carbonyl which is formed by the donation of an electron pair from a filled d-orbital of metal into the vacant antibonding π-orbital of CO, strengthens the M...

Metal carbonyls gain some extra stability due to the formation of synergic bonds. These synergic bonds are formed by lone pair electrons of central metal and... Vaccant anti bondin...