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Pi bonds

Posted: Sun Jun 03, 2018 9:46 pm
by Jose Lupian 1C
I know that pi bonds don't allow atoms to rotate but I didn't understand the reason why. Could someone please explain?

Re: Pi bonds

Posted: Sun Jun 03, 2018 9:48 pm
by JulietOttenberg-1C
Because pi bonds consist of electron density on either side of the internuclear axis, the atoms cant really move out of that configuration or else the bonds wouldn't be there. It's basically just because pi bonds have two areas of electron density rather than one area.

Re: Pi bonds

Posted: Sun Jun 03, 2018 9:52 pm
by Molly Oakes 1A
Pi bonds come from the overlap of parallel p orbitals on adjacent atoms. Rotation would break the side-by-side positioning.

Re: Pi bonds

Posted: Sun Jun 03, 2018 10:12 pm
by Isobel Tweedt 1E
When determining pi bonds in double and triple bonds does it matter which bond is "selected" as the pi and sigma bonds?

Re: Pi bonds

Posted: Sun Jun 03, 2018 10:15 pm
by Zuri Smith 1A
From what I understood in lecture, if there is a single bond, it will always be a sigma bond. A double bond will be one sigma bond and one pi bond. A triple bond will be one sigma bond and two pi bonds.

However, I do not know which of the bonds are which. Could someone explain further?