Difference Between torsional strain, steric strain, and bond angle strain

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Omeed_Partovi_1L
Posts: 12
Joined: Sat Jul 09, 2016 3:00 am

Difference Between torsional strain, steric strain, and bond angle strain

Postby Omeed_Partovi_1L » Mon Mar 13, 2017 6:43 pm

Can anyone clarify the differences between torsional strain, steric strain, and bond angle strain?

Hung_Sabrina_3N
Posts: 22
Joined: Fri Jul 22, 2016 3:00 am

Re: Difference Between torsional strain, steric strain, and bond angle strain

Postby Hung_Sabrina_3N » Tue Mar 14, 2017 10:39 am

A torsional strain is the repulsion caused by the electrons in between different groups when they pass by each other. A steric strain is caused by the electrons in between different groups. Steric strain cannot be lessened by rotating the molecule around a bond. An angle strain is caused when the actual bond angles in the atoms of the molecule differ from the ideal bond angles of their geometry.

Janice Kim 3I
Posts: 33
Joined: Wed Sep 21, 2016 2:56 pm

Re: Difference Between torsional strain, steric strain, and bond angle strain

Postby Janice Kim 3I » Tue Mar 14, 2017 3:10 pm

Torsional strain is caused by unfavorable electrostatic interaction. When molecules are eclipsed (as when the carbon atoms are in a planar geometry), the regions of electron density from the eclipsed atoms are closer together, thus leading to higher energy and less stability of the molecule. Steric strain is when the outer radius of atoms are physically bumping into each other. A bond angle strain occurs when the bond angle is distorted from the ideal bond angles.


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