What does mesomeric effect mean?
Definitions for mesomeric effect
me·someric ef·fect
This dictionary definitions page includes all the possible meanings, example usage and translations of the word mesomeric effect.
Wiktionary
mesomeric effectnoun
the increased stability of organic compounds having alternate single and double bonds
Wikipedia
Mesomeric effect
The mesomeric effect (or resonance effect) in chemistry is a property of substituents or functional groups in a chemical compound. It is defined as the polarity produced in the molecule by the interaction of two pi bonds or between a pi bond and lone pair of electrons present on an adjacent atom. This change in electron arrangement results in the formation of resonance structures that hybridize into the molecule's true structure. The pi electrons then move away from or toward a particular substituent group. The mesomeric effect is stronger in compounds with a lower ionization potential. This is because the electron transfer states will have lower energies.
Wikidata
Mesomeric effect
The mesomeric effect or resonance effect in chemistry is a property of substituents or functional groups in a chemical compound. The effect is used in a qualitative way and describes the electron withdrawing or releasing properties of substituents based on relevant resonance structures and is symbolized by the letter M. The mesomeric effect is negative when the substituent is an electron-withdrawing group and the effect is positive when based on resonance and the substituent is an electron releasing group. ⁕Examples of -M substituents: acetyl - nitrile - nitro ⁕Examples of +M substituents: alcohol - amine-benzene The net electron flow from or to the substituent is determined also by the inductive effect. The mesomeric effect as a result of p-orbital overlap has absolutely no effect on this inductive effect, as the inductive effect is purely to do with the electronegativity of the atoms and their topology in the molecule. The concepts of mesomeric effect, mesomerism and mesomer were introduced by Ingold in 1938 as an alternative to the Pauling's synonymous concept of resonance. "Mesomerism" in this context is often encountered in German and French literature but in English literature the term "resonance" dominates.
Numerology
Chaldean Numerology
The numerical value of mesomeric effect in Chaldean Numerology is: 4
Pythagorean Numerology
The numerical value of mesomeric effect in Pythagorean Numerology is: 1
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"mesomeric effect." Definitions.net. STANDS4 LLC, 2024. Web. 1 May 2024. <https://www.definitions.net/definition/mesomeric+effect>.
_V.1.png/600px-Mesomeric_effect_(+M)_V.1.png "mesomeric effect")
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