Coordination & Organometallic Chemistry: Complete Handwritten Revision Notes (PDF)
High-yield revision notes, reaction mechanisms, electron counting tricks, catalytic cycles, and quick formula sheets designed specifically for CSIR UGC NET, GATE (CY), BARC, and TIFR aspirants.
📚 Study Material Specifications & Syllabus Coverage
Inorganic Chemistry carries 60 to 75 marks in CSIR NET Chemical Science, with Coordination and Organometallic Chemistry making up nearly 65% of the inorganic section. These notes cover:
| Module Name | Coordination Compounds & Organometallic Chemistry |
|---|---|
| Applicable Examinations | CSIR UGC NET (JRF/LS), GATE Chemistry (CY), TIFR, BARC, SET |
| Document Quality | High-contrast topper-written scanned PDF |
| Access Cost | 100% Free (No paywall or registration) |
| Discussion Group | Join ChemistryABC Discussion Group |
🔬 Part 1: High-Yield Coordination Chemistry Revision
For an octahedral complex [ML6]n+, CFSE is calculated as:
Where nt2g and neg represent the number of electrons in t2g and eg sets, and m is the number of newly formed electron pairs compared to the free ion state.
Due to smaller splitting energy (Δt < P), tetrahedral complexes are universally high-spin.
I− < Br− < S2− < SCN− < Cl− < NO3− < F− < OH− < C2O42− < H2O < NCS− < edta4− < NH3 < en < bipy < phen < NO2− < PPh3 < CN− ≈ CO
Jahn-Teller theorem states that any non-linear molecular system in a degenerate electronic state will undergo distortion to remove degeneracy:
| Electronic Configuration | Spin State | Degeneracy Level | Type of JTD Expected |
|---|---|---|---|
| d1, d2 | High / Low | Asymmetric t2g | Weak (Dynamic Distortion) |
| d3, d8, d10 | All | Symmetric t2g & eg | No JTD (No Distortion) |
| d4 (Cr2+, Mn3+) | High-Spin (t2g3eg1) | Asymmetric eg | Strong JTD (Static Elongation) |
| d7 (Co2+, Ni3+) | Low-Spin (t2g6eg1) | Asymmetric eg | Strong JTD (Static Elongation) |
| d9 (Cu2+) | High / Low (t2g6eg3) | Asymmetric eg | Very Strong JTD (Tetragonal z-out) |
CN− ≈ CO ≈ C2H4 > PR3 ≈ H− > CH3− > C6H5− > I− ≈ SCN− > Br− > Cl− > Pyridine > NH3 > OH− > H2O
Get All Derivations & Reaction Mechanisms
Download the complete handwritten PDF containing solved previous year questions (PYQs).
📥 FAST DOWNLOAD PDF⚙️ Part 2: High-Yield Organometallic Chemistry & Catalysis
Mastering electron counts for complex ligands is the fastest way to solve 4-mark questions in CSIR NET Part C:
| Ligand Type | Formula / Coordination | Neutral (Covalent) Method | Ionic (Charge) Method |
|---|---|---|---|
| Hydride / Halide | −H, −Cl, −Br, −I (terminal) | 1 e− | 2 e− (−1 charge) |
| Bridging Halide | μ2−Cl | 3 e− | 4 e− (−1 charge) |
| Carbonyl / Phosphine | −CO, −PR3 | 2 e− | 2 e− (0 charge) |
| Nitrosyl (Linear) | −NO (M−N−O = 180°) | 3 e− | 2 e− (+1 charge NO+) |
| Nitrosyl (Bent) | −NO (M−N−O ≈ 120°) | 1 e− | 2 e− (−1 charge NO−) |
| Allyl Group | η1-allyl / η3-allyl | 1 e− / 3 e− | 2 e− / 4 e− (−1 charge) |
| Cyclopentadienyl | η1-Cp / η5-Cp | 1 e− / 5 e− | 2 e− / 6 e− (−1 charge) |
| Carbene (Fischer / Schrock) | =CR2 | 2 e− | 2 e− (neutral / −2 charge) |
Total M−M Bonds = [18 × n − TVE] / 2
M−M Bonds Per Metal Atom = 18 − (TVE / n)
Where n is the number of metal centers in the polynuclear carbonyl cluster.
| Structure Type | Skeletal Electron Pairs (SEP) | Total Skeletal Electrons | Standard Borane Formula |
|---|---|---|---|
| Closo | n + 1 | 2n + 2 | BnHn2− |
| Nido | n + 2 | 2n + 4 | BnHn+4 |
| Arachno | n + 3 | 2n + 6 | BnHn+6 |
| Hypho | n + 4 | 2n + 8 | BnHn+8 |
| Klado | n + 5 | 2n + 10 | BnHn+10 |
| Catalytic Process | Active Catalyst / Precursor | Oxidation State Shifts | Key Intermediate Reaction Steps |
|---|---|---|---|
| Wilkinson’s Hydrogenation | RhCl(PPh3)3 (16 e−) | Rh(I) ⇔ Rh(III) | Oxidative Addition → Alkene Coordination → Migratory Insertion → Reductive Elimination |
| Wacker Process | [PdCl4]2− + CuCl2 | Pd(II) → Pd(0) → Pd(II) | Nucleophilic attack of OH− on coordinated alkene → β-hydride elimination |
| Monsanto Acetic Acid | [Rh(CO)2I2]− (16 e−) | Rh(I) ⇔ Rh(III) | Rate-determining oxidative addition of CH3I to Rh(I) center |
| Cativa Process | [Ir(CO)2I2]− + Ru promoter | Ir(I) ⇔ Ir(III) | Faster rate than Monsanto; less water required, suppresses by-products |
| Hydroformylation (Oxo) | HCo(CO)4 or HRh(CO)(PPh3)3 | Co(I) or Rh(I) | Alkene insertion into M−H followed by CO insertion → Acyl intermediate |
- Concept Mastery: Read through each chapter in these handwritten notes, paying particular attention to the step-by-step mechanism of catalytic cycles and the 18-electron rule.
- PYQ Solving (Last 10 Years): Solve Part C questions (4 marks each) from CSIR NET 2015 to 2026 at least three times. Organometallic questions are highly repetitive in pattern.
- Formula Flashcards: Make short 1-page formula summaries of CFSE values, term symbols, Tanabe-Sugano rules, and Wade’s electron count rules for weekly quick revision.
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Sir these notes are very good and usefull..
Can you please upload new updated notes of Reagents , Name reaction and Main group
Sure we will update!
okie thank you sir