General Characteristics and History
Concept Overview
Organometallic chemistry studies compounds containing at least one direct Metal–Carbon covalent bond. It bridges classical inorganic coordination chemistry and organic chemistry.
Unlike classical complexes (high oxidation states, N/O/halogen donors), organometallic complexes often stabilize low oxidation states (0, −1, or low positive values) through strong σ-donor and π-acceptor ligands (CO, phosphines, cyclopentadienyl).
Because low-oxidation-state metals are highly electron-rich, many organometallic compounds are pyrophoric (ignite on contact with air/moisture) and require synthesis under inert atmosphere (Schlenk lines, gloveboxes).
Key Equations
This module is conceptual — no key equations. The quantitative framework begins in Module B3 (18-Electron Rule).
Worked Examples
Classical Complex vs. Organometallic Complex
Classify and as classical or organometallic.
Common Misconceptions
❌ Misconception
Any metal-containing compound that coordinates carbon is organometallic.
✅ Correction
Compounds where carbon is part of a non-metal-carbon bond (carbonates, some cyanides) are not organometallic. There must be a direct, covalent-type metal–carbon bond.
Interactive Visual
Key milestones in organometallic chemistry:
William Zeise synthesizes K[PtCl₃(η²-C₂H₄)]⁻, the first transition metal-olefin complex.
Ludwig Mond discovers Ni(CO)₄, enabling nickel purification via volatile carbonyl formation.
Kealy & Pauson synthesize Fe(η⁵-C₅H₅)₂, the first sandwich compound. Woodward and Wilkinson elucidate its structure.
Geoffrey Wilkinson develops RhCl(PPh₃)₃, the first practical homogeneous hydrogenation catalyst.
Ernst Otto Fischer and Geoffrey Wilkinson receive the Nobel Prize in Chemistry for metallocenes.
Nobel Prize for olefin metathesis catalysts — organometallic catalysis at its finest.