हिंदी
Karnataka Board PUCPUC Science 2nd PUC Class 12

Isomerism in Coordination Compounds

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Estimated time: 9 minutes
CBSE: Class 12
Maharashtra State Board: Class 12

Definition: Isomerism

Isomerism is the phenomenon in which compounds have the same molecular formula but differ in their physical or chemical properties due to a different arrangement of atoms or groups in space or structure.

CBSE: Class 12

Definition: Cis-isomer

In a disubstituted complex molecule/ion, when two same ligands are at right angles (90°), the geometrical isomer is known as a cis-isomer.

CBSE: Class 12

Definition: Trans-isomer

When two ligands are in opposite directions, i.e., at 180° to each other, the isomer formed is the trans-isomer.

CBSE: Class 12

Definition: Enantiomers

Optical isomers are mirror images that cannot be superimposed on one another. These are called enantiomers.

CBSE: Class 12
Maharashtra State Board: Class 12

Key Points: Isomerism in Coordination Compounds

Main Type Subtype Condition / Description Key Rule Example
Stereoisomerism Geometrical (cis–trans) Different spatial arrangement cis = 90°, trans = 180° [Pt(NH₃)₂Cl₂]
  Optical Non-superimposable mirror images No plane of symmetry [Co(en)₃]³⁺
Structural Isomerism Ionisation Exchange of ions inside/outside coordination sphere Counter ion acts as ligand [Co(NH₃)₅SO₄]Br / [Co(NH₃)₅Br]SO₄
  Linkage Ambidentate ligand attaches via different atoms NO₂⁻, SCN⁻ [Co(NH₃)₅NO₂]Cl₂ / [Co(NH₃)₅ONO]Cl₂
  Coordination Ligand exchange between metal complexes Two metal centers involved [Co(NH₃)₆][Cr(CN)₆]
  Solvate (Hydrate) Solvent inside vs outside coordination sphere Crystal water difference [Cr(H₂O)₆]Cl₃ / [Cr(H₂O)₅Cl]Cl₂·H₂O

Shaalaa.com | Coordination Compounds part 11 (Isomerism :- geometrical, optical)

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