AX3E2 structure

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Hamilton Oh Dis 3L
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Joined: Fri Sep 25, 2015 3:00 am

AX3E2 structure

Postby Hamilton Oh Dis 3L » Thu Oct 22, 2015 3:22 pm

Why does AX3E2 form a T-shape? Shouldn't it be trigonal planar with the two lone pairs on opposite sides from each other (180degrees)?

nickgonzalez 1j
Posts: 19
Joined: Fri Sep 25, 2015 3:00 am

Re: AX3E2 structure

Postby nickgonzalez 1j » Thu Oct 22, 2015 3:46 pm

AX3E2 forms a T-shape because you can think of it as starting at a trigonal bipyramidal shape(AX5) as it has 5 regions of electron densities. From here, if you remove one of the bonded atoms and replace it with a lone pair, you will get a see saw shape with bonds that are less than 120 degrees, less than 90 degrees, and less than 180 degrees because of the repulsion from the lone pair. Finally, when another bonded atom is taken away from this see saw structure and replaced with a lone pair, a T-shape is left where the bond angles are less than 90 degrees and less than 180 degrees. Image

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