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Chemistry · Glossary

What is Isolobal fragments?

Also known as: isolobal analogy

Definition 20.16 University Chemistry — Year 3 · Chapter 20 — Organometallic Chemistry: Bonding and Ligands

Two molecular fragments are isolobal when the number, symmetry, approximate energy and shape of their frontier orbitals, and the number of electrons in them, are similar. The isolobal analogy predicts that isolobal fragments can replace one another in molecules.

The isolobal series (frontier hybrids drawn schematically): each organic fragment and the metal carbonyl fragment opposite it have the same number of outward-pointing frontier orbitals and of electrons in them, and combine in analogous ways.
The isolobal series (frontier hybrids drawn schematically): each organic fragment and the metal carbonyl fragment opposite it have the same number of outward-pointing frontier orbitals and of electrons in them, and combine in analogous ways.
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