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Topic: steric hindrance  (Read 2272 times)

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Offline boodyx1

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steric hindrance
« on: January 15, 2010, 06:31:28 PM »
steric hindrance(in organic molecule) affect absorptivity,absorbance and intensity of (u.v-v.light) spectra.explain? (please in details) :D

Offline cpncoop

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Re: steric hindrance
« Reply #1 on: January 15, 2010, 07:14:43 PM »
When a molecule absorbs light, it takes a bonding electron and excites it to either a non-bonding orbital.  This changes the bond length, and the molecule vibrates or emits light to return to it's ground state.  If a molecule is severely hindered (in terms of geometry or sterics), transitions can be shifted to higher energies, as the conformational changes required to achieve a stable excited state have a greater energy barrier.

Offline boodyx1

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Re: steric hindrance
« Reply #2 on: January 16, 2010, 07:46:31 AM »
thank you  ;D

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