Which of the following statements is correct with respect to the metal carbonyls of I st transition series?
Text Solution
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Order of C–O bond strength :
[Mn(CO) 6 ] + > [Cr(CO) 6 ] > [V(CO) 6 ] – > [Ti(CO) 6 ] 2– and [Ni(CO) 4 ] > [Co(CO) 4 ] – > [Fe(CO) 4 ] 2– .
True statement.
As + ve charge on the central metal atom increases, the less readily the metal can donate electron density into the π * orbitals of CO ligand to weaken the C–O bond.
In the carbonylate anions, the metal has a greater electron density to be dispersed, with the result that M–C π bonding is enhanced and the C–O bond is diminished in strength.
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