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Pentagonal bipyramidal

Posted: Fri Nov 30, 2018 4:13 pm
by ian_haliburton_1f
The textbook lists pentagonal bipyramidal as a possible molecular geometry, but I don’t believe that any of the examples we’ve done have had this shape. Is it super rare? What would be an example of a molecule with this shape?

Re: Pentagonal bipyramidal

Posted: Fri Nov 30, 2018 4:17 pm
by Lauren Ho 2E
IF7 is an example of a molecule with this shape!

Re: Pentagonal bipyramidal

Posted: Fri Nov 30, 2018 5:41 pm
by Rebecca Altshuler 1D
Any molecule with the VSEPR formula AX7 will be pentagonal bipyramidal. I don't know whether or not it's rare, but we definitely haven't covered it in class, so I would guess it's not super common.

Re: Pentagonal bipyramidal

Posted: Fri Nov 30, 2018 5:44 pm
by Jeannine 1I
My TA told us that usually a central atom will at most form 6 bonds, with a total of 12 valence electrons in its outermost shell, so since pentagonal bipyramidal has 7 bonds to its central atom, I think it is a rarity.

Re: Pentagonal bipyramidal

Posted: Fri Nov 30, 2018 5:55 pm
by Chris Freking 2G
ZrF73- and HfF73 also have pentagonal bipyramidal shape.