Which of following organometallic compound is \(\sigma\) and \(\pi\) bonded
[Fe(η5 – C5H5)2]
K[PtCl3(η2– C2H4)]
[Co(CO)5NH3]+2
Fe(CH3)3
The Correct Option is C
Solution and Explanation
The correct option is(C): [Co(CO)5NH3]+2.
\(\sigma\) Bonds: In this complex, the bond between the cobalt atom (Co) and the ammonia molecule (NH3) is a \(\sigma\) (sigma) bond. Sigma bonds are formed by the head-on overlap of atomic orbitals.
\(\pi\) Bonds: The five carbon monoxide (CO) ligands in the complex are bonded to the cobalt atom via \(\pi\) (pi) bonds. Pi bonds result from the side-to-side overlap of p orbitals. Each CO ligand contributes one π bond to the complex, and since there are five CO ligands, there are a total of five \(\pi\)bonds.
So, [Co(CO)5NH3]+2 contains both \(\sigma\) and \(\pi\) bonds,
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Applications of Coordination Compounds
There are three applications of coordination compounds:
- Zinc-complex enzymes like carbonic anhydrase important to buffering reactions in blood.
- Copper-complex enzymes important to iron storage and producing pigments in hair, skin, and eyes.
- Nickel-complex enzymes as part of the enzymes urease and hydrogenase