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Dipole moments in trigonal bipyramidal shaped molecules

Posted: Sun Nov 17, 2019 12:04 pm
by Ryan Juncker 3D
In a perfectly symmetrical trigonal bipyramidal molecule do the dipole moments all cancel like they do in a symmetrical tetrahedral or can these molecules still be polar?

Re: Dipole moments in trigonal bipyramidal shaped molecules

Posted: Sun Nov 17, 2019 12:30 pm
by Ada Chung 1C
In a trigonal bipyramidal shaped molecule, the polar bonds wouldn't cancel so this molecule would still be considered polar. If you look at the geometry you can see that it is not symmetrical in such a way that the dipole moments would cancel.

Re: Dipole moments in trigonal bipyramidal shaped molecules

Posted: Sun Nov 17, 2019 12:37 pm
by eduardomorales5
For molecules that are highly symmetrical, like the trigonal bipyramidal, octahedral, and tetrahedral, the individual dipoles will usually cancel out, as they are typically non-polar molecular structures. However, if some of the atoms attached to a trigonal bipyramidal molecule, for example, are not the same, then it can become a polar molecule. Take CH4Cl, while it is in a trigonal bipyramidal shape, the electronegativity of the chlorine atom will pull more electrons toward it and create a dipole moment that makes the molecule polar.

Re: Dipole moments in trigonal bipyramidal shaped molecules

Posted: Sun Nov 17, 2019 12:38 pm
by JTijerina_4A
In addition to shape it is also important to note which atoms compose the molecule and their respective electronegativities.

Re: Dipole moments in trigonal bipyramidal shaped molecules

Posted: Sun Nov 17, 2019 4:02 pm
by Aliya Jain 2B
Different atoms often have differences in electronegativity which causes them to be polar even if their geometry is symmetrical.