Bond Angle Strain vs. Torsional Strain

jyc185
Posts: 8
Joined: Fri Sep 20, 2013 3:00 am

Bond Angle Strain vs. Torsional Strain

What is the exact difference between a bond angle strain and a torsional strain? I'm having a hard time grasping the two ideas.

Jonathan Shih 3H
Posts: 37
Joined: Fri Sep 25, 2015 3:00 am

Re: Bond Angle Strain vs. Torsional Strain

Hey,

I'm not sure we need to know this distinction since it seems like this is 14C material, but here's a UCLA resource (I think it's actually from Hardinger's class) that could help clarify the distinction between the two types of strains. http://www.chem.ucla.edu/harding/notes/strain_02.pdf

Hope the reference helps!

Shrita Pendekanti 4B
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

Re: Bond Angle Strain vs. Torsional Strain

Torsional strain is caused by electron repulsion between neighboring atoms while bond angle strain is caused when bond angles disagree with the ideal orientation of the molecule. Hope this helps!

zhajee
Posts: 23
Joined: Fri Sep 25, 2015 3:00 am

Re: Bond Angle Strain vs. Torsional Strain

Does torsional strain always have to occur between two atoms orthogonal to each other?

chemgal4L
Posts: 19
Joined: Fri Sep 25, 2015 3:00 am

Re: Bond Angle Strain vs. Torsional Strain

what exactly does orthogonal to each other mean..?

Posts: 9
Joined: Fri Sep 25, 2015 3:00 am

Re: Bond Angle Strain vs. Torsional Strain

On Wednesday's lecture, Dr. Lavelle mentions an additional strain "when atoms are physically bumping into each other" how does this relate to the torsional strain?

Shaye Busse 3B
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

Re: Bond Angle Strain vs. Torsional Strain

When atoms are physically bumping into each other, this is a different kind of strain called steric strain. This in addition to torsional and bond angle strain will make up the difference in potential energy from one conformation to another.

Shirley Wong 2E
Posts: 22
Joined: Fri Sep 25, 2015 3:00 am

Re: Bond Angle Strain vs. Torsional Strain

Does all eclipsed molecules have torsional strain?

Megan FitzPatrick 1C
Posts: 17
Joined: Fri Sep 25, 2015 3:00 am

Re: Bond Angle Strain vs. Torsional Strain

I am pretty sure the answer is yes, as long as the molecule is made up of neighboring carbons with hydrogens that eclipse (overlap in space).