Torsional & Steric Strain

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Alexis Moran2B
Posts: 10
Joined: Mon Jan 26, 2015 2:17 pm

Torsional & Steric Strain

Postby Alexis Moran2B » Sun Mar 06, 2016 5:52 pm

What exactly is the difference between Torsional and Steric Strain? I understand Steric strain occurs in non bounded interactions but what exactly does that mean? How are they each measured and identified in a conformation?

Jacob Shalkevich 1A
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

Re: Torsional & Steric Strain

Postby Jacob Shalkevich 1A » Sun Mar 06, 2016 6:26 pm

"Torsional Strain: When rotating a molecule around a bond, the torsional
strain is the repulsion caused by the electrons in between different groups
when they pass by each other.

Steric Strain: Strain caused by the electrons in between different groups.
Steric strain cannot be lessened by rotating the molecule around a bond."

Definitions on a UCLA website, hope these help!

VictoriaRoderick_3A
Posts: 42
Joined: Fri Sep 25, 2015 3:00 am

Re: Torsional & Steric Strain

Postby VictoriaRoderick_3A » Sun Mar 06, 2016 6:27 pm

Torsional strain is developed from the electron activity surrounding each atom. When the molecule is eclipsed, the electrons are being forced together, and they naturally repel.

Steric strain is developed from physical interactions. This is when the actual atoms are hitting each other due to the close proximity.


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