Eclipsed (0) vs. Eclipsed(+120)

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Katrina Jang 2H
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Joined: Fri Sep 25, 2015 3:00 am

Eclipsed (0) vs. Eclipsed(+120)

Postby Katrina Jang 2H » Sun Mar 06, 2016 5:39 pm

Why is eclipsed at 0 degrees at a higher energy than eclipsed at 120 degrees?

nickgonzalez 1j
Posts: 19
Joined: Fri Sep 25, 2015 3:00 am

Re: Eclipsed (0) vs. Eclipsed(+120)

Postby nickgonzalez 1j » Mon Mar 07, 2016 9:18 am

I don't think that this would always be the case, it depends on the molecule. For example, if you have ethane, the energy would be the same no matter what angle it is eclipsed at as no matter how it were to be arranged, the hydrogens would be eclipsed. A case where the molecule eclipsed at 0 degrees is at a higher energy than eclipsed at 120 degrees would be if the larger substituents(such as if the molecules were each to have 1 methyl group) and the two methyl groups overlapped at 0 degrees only. When this occurs there would be increased steric interactions and therefore higher energy.

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