Coordination Compounds
CBSE · Class 12 · Chemistry
Quick revision notes for Coordination Compounds — CBSE Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Werner's Theory and Basic Concepts
- Alfred Werner proposed primary valence (oxidation state) and secondary valence (coordination number)
- Primary valences are ionizable and satisfied by anions, secondary valences are non-ionizable
- Coordination entities have definite geometry: octahedral (CN=6), tetrahedral (CN=4), square planar (CN=4)
Ligand Types and Denticity
- Unidentate ligands: Cl⁻, NH₃, H₂O, CN⁻ (one donor atom)
- Bidentate ligands: en (ethylenediamine), ox²⁻ (oxalate) (two donor atoms)
- Polydentate ligands: EDTA⁴⁻ (hexadentate - 6 donor atoms)
IUPAC Nomenclature Rules
- Cation named first, then anion (regardless of which contains complex)
- Within coordination sphere: ligands named alphabetically before metal
- Anionic ligands end in -o (chlorido, cyano, oxalato)
Isomerism in Coordination Compounds
- Structural Isomerism: Different bonding patterns - linkage, coordination, ionization, solvate
- Stereoisomerism: Same bonds, different spatial arrangements - geometrical and optical
- Geometrical isomerism: cis-trans in square planar/octahedral, fac-mer in octahedral
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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