2.7 - How to determine main structure if formal charges are equal?

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nicolely2F
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Joined: Sat Sep 14, 2019 12:17 am

2.7 - How to determine main structure if formal charges are equal?

Postby nicolely2F » Sat Nov 09, 2019 12:25 pm

Exercise 2.7 asks to draw all the resonance structures for the salt (a chain structure) and to indicate the most important structure (where there aren't any two like charges side-by-side). I drew the three structures, but all three structures have 2 N-atoms with FC = +1 and 1 N-atom with FC = -1. In this case, how do I determine the structure of lowest energy?

Daria Azizad 1K
Posts: 116
Joined: Thu Jul 25, 2019 12:15 am

Re: 2.7 - How to determine main structure if formal charges are equal?

Postby Daria Azizad 1K » Sat Nov 09, 2019 12:57 pm

Usually, it is best to have differing FC side by side (like a -1 next to +1) rather than the same FC side by side (like +1 next to +1) because it is unlikely that there would be two same charge centers in close proximity due to repulsive forces.

Amina Durrani 3G
Posts: 52
Joined: Sat Jul 20, 2019 12:16 am

Re: 2.7 - How to determine main structure if formal charges are equal?

Postby Amina Durrani 3G » Sat Nov 09, 2019 1:02 pm

The lowest energy structure would have the most electronegative N in the middle (-1 FC) and the two other N’s (+1 FC) on either side.


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