What is the definition of organometallic chemistry?
The study of compounds containing at least one direct metal–carbon bond.
Are metal hydrides considered organometallic?
Often yes — H is treated as a small organic group.
Which are not considered organometallic compounds?
Metal acetates, alkoxides (e.g., NaOCH₃), crown ether complexes, metal carbonyls without M–C bonds, metal acac complexes.
Why are metal–carbon bonds important?
They enable catalytic transformations, C–C bond formation, polymerization, and industrial reactions.
What are the two key interactions in the DCD model?
σ-donation from alkene → metal; π-backbonding from metal → alkene π*.
What does π-backbonding do to the C=C bond?
Weakens and lengthens it by filling the π* antibonding orbital.
What happens to the geometry of the alkene upon complexation?
The hydrogens bend back (toward sp³-like geometry).
In Zeise’s salt, is the C=C longer or shorter than free ethylene
Longer, due to π-backbonding reducing bond order.
why is organometallic chemistry essential in industry?
Basis of homogeneous catalysis; used in polymer production, pharmaceuticals, detergents, semiconductors.
What is the importance of organometallic chemistry in catalysis?
Provides mechanisms for C–H activation, hydrogenation, olefin metathesis, hydroformylation, etc.
Who discovered the first organometallic π-complex?
William Christopher Zeise (Zeise’s salt).
: What is Zeise’s salt?
K[PtCl₃(C₂H₄)]·H₂O — first metal–alkene π-complex.
How was the structure of Zeise’s salt finally confirmed?
By X-ray crystallography.
Who introduced the term “organometallic”?
Sir Edward Frankland.
What was Frankland known for?
Early organozinc compounds and foundations of valence theory.
What model explains metal–alkene bonding?
Dewar–Chatt–Duncanson Model.
