Question

UV-Vis spectroscopy of organic compounds is usually concerned with which electronic transition(s)?
A.Ï â Ï*
B. n â Ï*
C. n â Ï* and Ï â Ï*
D. none of these

Answer 1

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[B] is the correct option



→ UV-Vis spectroscopy of organic compounds is usually concerned with which electronic transition(s) n â Ï*.



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Answer 2

C) n → π* and π → π* electronic transitions are usually concerned.

UV-Vis Spectroscopy

• UV-Vis Spectroscopy, also known as electronic spectroscopy, is based on the transition of electrons from one molecular orbit to another.
• When a molecule absorbs energy, an electron, from the absorption of the electromagnetic radiation, jumps from an occupied orbital to an unoccupied one.

n → π* and π → π* electronic transitions in UV-Vis Spectroscopy

• The possible number of jumps are from bonding orbital(s) to anti-bonding orbital(s) and from non-bonding orbital(s) to anti-bonding orbital(s).
• Out of the possible jumps, n → π* and π → π* are of importance because these two transitions support experiments due to their presence in the convenient region of the spectrum (200-700 nm).
• Both n → π* and π → π* transitions need an unsaturated functional group to provide the p-orbital.  

UV-Vis Spectroscopy is based on the transition of electrons from one molecular orbit to another. Out of the possible jumps, n → π* and π → π* electronic transitions are usually concerned in organic spectroscopy as their transition wavelengths lie between 200-700 nm.