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mesomeric effect
This term is a specialized technical expression used almost exclusively in organic chemistry and molecular orbital theory. It describes the resonance-driven shift of electrons across a system of alternating single and double bonds, which alters the electronic properties of the molecule.
In a professional academic context, it is often used interchangeably with the term resonance effect. However, the mesomeric effect specifically emphasizes the influence of a substituent group on the electron density of a conjugated system, typically categorized as positive (+M) for electron-donating groups or negative (-M) for electron-withdrawing groups.
Meanings
The redistribution of electron density in a conjugated system through the delocalization of pi electrons or lone pairs, which influences the reactivity and stability of a molecule.