Illustrated Glossary of Organic Chemistry

Pi bond (π bond): A bond formed by the overlap of p orbitals on adjacent atoms, perpendicular to any sigma bond(s) between the same atoms. Indicated in a Kekule structure or bond-line structure as an extra line parallel to the line which represents the sigma bond. A pi bond has two orbital lobes, one above and one below the plane of the sigma bond.



Related terms: Pi electron, pi antibonding molecular orbital, π* molecular orbital, σ bond, atomic orbital, s orbital, molecular orbital, hybrid orbital, sp3, sp2, sp
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