strength of bonds

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704992521
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Joined: Fri Apr 06, 2018 11:05 am

strength of bonds

Postby 704992521 » Mon Jun 11, 2018 9:33 am

What allows for the different strength in bonds and lack of rotation in pi bonds?

Jessica Lancisi - 1I
Posts: 29
Joined: Fri Apr 06, 2018 11:03 am

Re: strength of bonds

Postby Jessica Lancisi - 1I » Mon Jun 11, 2018 12:53 pm

I believe this has to do with the overlapping of P orbitals in the pi bonds

Dennisse Diaz 1D
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Re: strength of bonds

Postby Dennisse Diaz 1D » Mon Jun 11, 2018 8:53 pm

A sigma bond remains unchanged upon rotation and so can rotate freely, but to rotate a pi bond you must break the chemical bond, rotate and reform. Bond breaking requires energy, and at room temperature the molecules do not have sufficient thermal energy to overcome the energy barrier. It is possible that at very high temperature (such that the thermal energy kT is larger than the bond-breaking energy) or by using photons to break the pi bond, the isomerism would be lost as the excited molecule would be able to rotate freely.

Chem_Mod
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Re: strength of bonds

Postby Chem_Mod » Thu Jun 14, 2018 5:11 pm

The different strengths in the bonds are also related to how well the orbitals overlap with another orbital to form a bond.


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