Resonance Chemistry Coordination Compounds

Sure! Here's a clear explanation of Resonance as it relates to Coordination Compounds in Chemistry:

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Resonance in Chemistry – Coordination Compounds

What is Resonance?

Resonance is a concept used to describe the delocalization of electrons in molecules or ions that cannot be represented by a single Lewis structure. Instead, multiple contributing structures (resonance structures) are drawn to show all possible placements of electrons.

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Resonance in Coordination Compounds

Coordination compounds involve central metal atoms or ions bonded to surrounding ligands. In some of these compounds, resonance occurs within the ligands or between metal and ligand due to the delocalization of π-electrons.

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Where Resonance is Seen in Coordination Compounds:

1. Ligands like NO₂⁻ (Nitrito/Nitro)

   • Can bind in different ways (linkage isomerism):
     • -NO₂ (nitro, N-bonded)
     • -ONO (nitrito, O-bonded)
   • Resonance occurs due to shifting of electrons between nitrogen and oxygen.

2. Carbonate (CO₃²⁻), Oxalate (C₂O₄²⁻) Ligands

   • These anionic ligands show resonance within their own structure.
   • The electron density is delocalized across multiple oxygen atoms.

3. π-backbonding and Resonance

   • In metal carbonyls like [Fe(CO)₅], resonance can be observed due to π-back donation:
     • The metal donates electron density into the π* (antibonding) orbital of CO.
     • This creates a resonance-type delocalization between metal and ligand.

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Effect of Resonance on Coordination Compounds:

• Stabilizes the ligand and the overall complex.
• Affects bond lengths (due to delocalization).
• Influences color, magnetism, and reactivity.

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Summary Table

Concept	Example	Resonance Role
Linkage isomerism	NO₂⁻ as ligand	Delocalization between N and O
Chelating ligands	Oxalate (C₂O₄²⁻), Carbonate (CO₃²⁻)	Delocalized π-system in ligand
π-back bonding	[Fe(CO)₅], [Ni(CO)₄]	Resonance between metal and CO

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Would you like diagrams, Hindi explanation, or MCQs on this topic too?

Resonance Chemistry Coordination Compounds

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SOLUTIONS OF COORDINATION COMPOUNDS

Coordination Compounds

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28. CO - O R D I N AT I O N COMPOUNDS

COORDINATION COMPOUNDS