Reason for 1 sigma and multiple pi bonds


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Anisha Chandra 1K
Posts: 118
Joined: Thu Jul 11, 2019 12:17 am

Reason for 1 sigma and multiple pi bonds

Postby Anisha Chandra 1K » Fri Nov 29, 2019 11:28 am

How come when you have a double or triple bond, there is only one sigma bond and the rest are pi bonds?

nicolely2F
Posts: 149
Joined: Sat Sep 14, 2019 12:17 am

Re: Reason for 1 sigma and multiple pi bonds

Postby nicolely2F » Fri Nov 29, 2019 11:53 am

A double or triple bond can only be formed if orbitals from the two bonding atoms overlap side by side, otherwise there'd be no space for electron bonding. This side by side alignment is a pi bond -- that's why in a non-single bond, the first bond is sigma and the rest are necessarily pi.

ZainAlrawi_1J
Posts: 71
Joined: Sat Aug 24, 2019 12:16 am

Re: Reason for 1 sigma and multiple pi bonds

Postby ZainAlrawi_1J » Fri Nov 29, 2019 2:34 pm

There must be a side by side overlap between orbitals in order for them to form double or triple bonds, this specific arrangement, wherein orbitals are bonded side by side as opposed to end to end, is referred to as pi bonding.

emwoodc
Posts: 55
Joined: Fri Aug 09, 2019 12:16 am

Re: Reason for 1 sigma and multiple pi bonds

Postby emwoodc » Fri Nov 29, 2019 9:15 pm

when you have double and triple bonds, the orbitals are overlapping side by side and this side by side overlap is called pi bonds. Everything overlapping is called pi bonds so the ones that are no overlapping, which only happens once is called sigma bonds.


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