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Topic: Why doesn't N4H4 look like this?  (Read 2658 times)

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Offline kaji

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Why doesn't N4H4 look like this?
« on: August 18, 2021, 07:26:38 AM »
Why doesn't N4H4 look like this? Each N would have a lone pair.
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Offline jeffmoonchop

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Re: Why doesn't N4H4 look like this?
« Reply #1 on: August 18, 2021, 01:51:15 PM »
Is this a homework question? Why do you think?
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Offline kaji

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Re: Why doesn't N4H4 look like this?
« Reply #2 on: August 22, 2021, 01:45:04 AM »
It's not, I am preparing for an exam, and I was asked to draw N4H4. And I came up with this solution, and don't know why it is wrong. Could I ask for a hint? There are 24 valence electrons, each N and H fulfill the octet rule so Idk what's wrong.
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Offline Orcio_87

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Re: Why doesn't N4H4 look like this?
« Reply #3 on: August 22, 2021, 04:34:43 AM »
Looks like N has a sp2 configuration (hybridization). On each N atom there is pair of electrons which occupies pi orbital perpendicular to the plane.

While maybe they will form two bonding and two anti-bonding orbitals, repulsion of the electrons will be higher than in H2N-N=N-NH2.

Furthermore - N-N-N angles are tightened from 120 to 90°.
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Offline Borek

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Re: Why doesn't N4H4 look like this?
« Reply #4 on: August 24, 2021, 05:33:59 PM »
Seems like this is actually one of several theoretically possible structures, at least as predicted by QM calculations.
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