Cheat sheet · JEE Preparation Chemistry
Coordination Compounds cheat sheet
The whole chapter on one page: key formulas, facts and the points to remember, for quick revision before a test.
JEE · Chemistry
Cheat sheet
Class 12 · Chapter 5Coordination Compounds
Strong-field ligands pair electrons: CO > CN⁻ > en > NH₃ > H₂O > F⁻ > Cl⁻.
1. Terms
- Ligand: donor of electron pairs (mono-, bi-, polydentate; ambidentate like NO₂⁻).
- Coordination number: number of donor atoms bound.
- Chelate: ring formed by polydentate ligand (EDTA⁴⁻ hexadentate).
2. Werner's Theory
- Primary valency: ionisable (oxidation state).
- Secondary valency: non-ionisable (coordination number), directional.
3. Naming
[Co(NH₃)₄Cl₂]Cl → tetraamminedichloridocobalt(III) chloride
Ligands alphabetical, then metal with oxidation state; anionic complexes end in -ate (ferrate, cuprate).
4. Bonding
| Hybridisation | Shape | Example |
|---|---|---|
| sp³ | tetrahedral | [Ni(CO)₄] |
| dsp² | square planar | [Ni(CN)₄]²⁻ |
| d²sp³ (inner) | octahedral | [Co(NH₃)₆]³⁺ |
| sp³d² (outer) | octahedral | [CoF₆]³⁻ |
Crystal field theory: octahedral splitting ; strong field ⇒ low spin. Colour from d–d transitions.
5. Key Points
- Isomerism: geometrical, optical, linkage, ionisation, hydrate, coordination.
- Cisplatin: anticancer.
- Chelates are extra stable.
- Haemoglobin and chlorophyll are complexes.
Remember: Werner | IUPAC naming | VBT shapes | CFT
Coordination Compounds: questions and notes
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