different conformation

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SoJeong Lee
Posts: 10
Joined: Wed Sep 21, 2016 2:55 pm

different conformation

Postby SoJeong Lee » Fri Mar 10, 2017 2:15 pm

Can someone explain why the staggered conformation has a lower energy compared to the eclipsed conformation?

Dianna Grigorian 1C
Posts: 72
Joined: Wed Sep 21, 2016 2:55 pm

Re: different conformation

Postby Dianna Grigorian 1C » Fri Mar 10, 2017 2:32 pm

Because the staggered conformation has C-H bonds on adjacent C, they are further away from each other. This means that there is greater space between the atoms and they are further away from the electron density regions that cause repulsion. With the eclipsed conformation, however, the C-H bonds are closer together and overlap. This can also be seen in the space filling model, which shows that there is not as much distance between the atoms. Because the regions of electron density are closer together, this results in repulsion causing a higher energy state than the staggered conformation.
Hope this helps!

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