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Terms Used in Coordination Chemistry

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Terms Used in Coordination Chemistry

Basic Terms:

  • Coordination sphere: Metal + ligands inside brackets
  • Charge number: Net charge on complex ion
  • Oxidation state: Charge on central metal ion
  • Coordination number: Number of donor atoms attached to metal

Double Salts vs Coordination Compounds:

Property Double Salt Coordination Compound
Dissociation Completely into ions Gives complex ion
Example Mohr’s salt K₄[Fe(CN)₆]
Maharashtra State Board: Class 12

Werner’s Theory

In coordination compounds, the central metal exhibits two types of valencies:

  • Primary valency
  • Secondary valency

Primary valency:

  • Satisfied by anions only
  • Depends on the oxidation state of the metal
  • Ionisable and non-directiona

lSecondary valency:

  • Satisfied by ligands
  • Represents the coordination number
  • Non-ionisable and directional
  • Determines the geometry of the complex
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