electromeric effect.pptx
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The electromeric effect refers to the temporary polarity produced in a multiple bonded compound when approached by a reagent, and only occurs in the presence of that reagent. For example, in ethylene the pi electrons of the carbon-carbon double bond completely transfer to one carbon atom when attacked by an electrophile, disturbing the molecular orbital symmetry. Addition then follows Markownikoff's rule, with the negative portion of the reagent adding to the carbon with fewer hydrogen atoms.
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Infrared Spectroscopy (IR Spectroscopy)
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Photon interaction with matter rahul
1. Photons interact with matter through various processes depending on their energy level. Low energy photons mainly undergo coherent scattering, while intermediate energies result in the Compton effect. Higher energy photons above 1.02 MeV can undergo pair production.
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- 2. DEFINITION • The Electromeric effect (E Effect) refers to the polarity produced in a multiple bonded compound as it is approached by a reagent. • Temporary effect. • Takes place only in the presence of a reagent.
- 3. • The electromeric effect is represented as: • When a double or triple bond is exposed to an electrophile (a reagent). The two π electrons which form the π bond are completely transferred to one atom or the other.
- 4. • Take an example of ethylene, when an electrophile attacks a carbon-carbon double bond in the ethylene molecule. We know that the double bond is made up of one sigma bond and one π bond. The electrons in the π bond are quite exposed. Under the influence of the electric field of the positively charged electrophile, the symmetry of the molecular orbital is disturbed entirely in favor of one carbon atom.
- 6. Addition takes place according to Markownikoff's rule which states that the negative portion of attacking reagent goes to carbon atom containing lesser number of hydrogen atoms.