Kit Library / Science / अकार्बनिक रसायन विज्ञान

⚡ Topic Learning Kit

Synergic Bonding in Metal-Carbonyl Complexes

English 17 leveled MCQs 18 flashcards 9 games Free

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💡 Key Idea

Two-Way Bonding Makes CO Stick Tight

CO donates in, metal donates back.

In synergic bonding, the ligand and metal give electrons to each other at the same time, so the two interactions reinforce one another.

↳ Synergic bonding is a mutual electron exchange that strengthens the metal-ligand bond far beyond a simple donation.

📖 Definition

What 'Synergic' Actually Means

Two bonds that boost each other.

↳ Synergic = simultaneous forward donation and backward donation that strengthen each other.

⚙️ Process

How the M–C–O Bond Forms Step by Step

Follow the electrons, both directions.

The result is a synergic bond where the metal and CO are held together much more strongly than by sigma donation alone.

↳ One sigma donation plus two pi back-bonds together create the synergic M–CO linkage.

📖 Smart notes

What you'll study, topic by topic

1

Synergic Bonding in Metal-Carbonyl Complexes

Synergic bonding explains why carbon monoxide binds so strongly to transition metals. It combines a sigma donation from CO to the metal with pi back-donation from the metal's d-orbitals into CO's antibonding pi* orbitals…

  • Synergic bonding involves two-way electron flow between a metal and a ligand.
  • The σ bond in the diagram goes from metal M to carbon of CO.
  • π back-bonds go from metal d-orbitals into π 2px* and π 2py* orbitals of CO.

~15 min · full explanation, examples & memory tricks in the app

❓ Leveled MCQ practice

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17 questions laddered from warm-up to topper-level, each with an explanation. A taste:

What is synergic bonding?

Beginner
A A two-way electron exchange between metal and ligand B A one-way donation from ligand to metal only C A hydrogen bonding interaction in carbonyls D A purely ionic attraction between metal and ligand
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A two-way electron exchange between metal and ligand

Synergic bonding involves σ donation from metal to ligand and π back-donation from metal d-orbitals to ligand π* orbitals, so it is a two-way exchange.

In the diagram, the σ bond arrow points from:

Beginner
A Oxygen of CO to the metal M B Metal M to the carbon of CO C Carbon of CO to the metal M D Metal M to the oxygen of CO
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Metal M to the carbon of CO

The σ bond arrow goes from M to C, meaning the metal donates σ electron density to the carbon of CO.

Which orbitals of CO accept π back-donation from the metal?

Beginner
A The σ* 2pz orbital only B π 2px* and π 2py* antibonding orbitals C σ 2pz bonding orbitals D The lone pair orbitals on carbon
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π 2px* and π 2py* antibonding orbitals

The diagram shows π back-bonds from metal d-orbitals into the π 2px* and π 2py* antibonding orbitals of CO.

Which ligands are named as forming synergic bonds with metals?

Beginner
A CH₄, C₂H₄, and C₂H₂ B CO, CN⁻, and NO C O₂, N₂, and F₂ D H₂O, NH₃, and Cl⁻
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CO, CN⁻, and NO

The source names CO, CN⁻, and NO as the classic synergic ligands because they have accessible π* orbitals.

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