Carbon and triple bonds

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Brett Lieuallen 2A
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Joined: Wed Sep 30, 2020 9:39 pm

Carbon and triple bonds

Postby Brett Lieuallen 2A » Fri Oct 30, 2020 4:49 pm

I know carbon can only form a triple bond with another carbon atom, but according to lewis structures there is another electron that can form a bond. Why can't carbon use this last electron and make a quadruple bond

StephanieIb
Posts: 105
Joined: Wed Sep 30, 2020 9:37 pm

Re: Carbon and triple bonds

Postby StephanieIb » Fri Oct 30, 2020 5:25 pm

The fourth bond in a quadruple bond is a delta bond. Carbon doesn't have any d electrons to form a delta bond. So carbon can never form quadruple bonds.

Rajshree 1F
Posts: 106
Joined: Wed Sep 30, 2020 9:32 pm

Re: Carbon and triple bonds

Postby Rajshree 1F » Sun Nov 01, 2020 9:24 am

i think it has to do with the structures of the p orbitals in the carbon atom. hopefully this picture will help better visualize.
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James Patanian 2C
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Joined: Wed Sep 30, 2020 9:55 pm

Re: Carbon and triple bonds

Postby James Patanian 2C » Sun Nov 01, 2020 9:26 am

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StephanieIb wrote:The fourth bond in a quadruple bond is a delta bond. Carbon doesn't have any d electrons to form a delta bond. So carbon can never form quadruple bonds.


So an atom would need a valence in the d orbital to form a delta/quadruple bond? Are these observed in nature frequently?

Brian_Wu_3B
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Joined: Wed Sep 30, 2020 9:41 pm

Re: Carbon and triple bonds

Postby Brian_Wu_3B » Sun Nov 01, 2020 5:05 pm

From this wikipedia article, https://en.wikipedia.org/wiki/Quadruple_bond, There seems to be a quadruple bond between Re - Re. It states that quadruple bonds usually form with d-block elements.

Pranav Daggubati 3C
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Joined: Wed Sep 30, 2020 9:35 pm

Re: Carbon and triple bonds

Postby Pranav Daggubati 3C » Sun Nov 01, 2020 5:34 pm

It is because the shape of the orbitals in carbon is tetrahedral, so making a quad bond creates a ton of stress, which makes it impossible for a quad bond to occur

Adrienne Chan 1G
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Joined: Wed Sep 30, 2020 9:40 pm

Re: Carbon and triple bonds

Postby Adrienne Chan 1G » Sun Nov 01, 2020 11:27 pm

Carbon can have non-bonding orbitals. If carbon had 4 bonds, the amount of energy gained by forming the bond would be offset by the electron repulsion.

James Patanian 2C
Posts: 54
Joined: Wed Sep 30, 2020 9:55 pm

Re: Carbon and triple bonds

Postby James Patanian 2C » Sat Nov 07, 2020 7:08 pm

Brian_Wu_3G wrote:From this wikipedia article, https://en.wikipedia.org/wiki/Quadruple_bond, There seems to be a quadruple bond between Re - Re. It states that quadruple bonds usually form with d-block elements.


Sorry for the late response but thanks Brian, that answers my question :)


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