Why isn't XeF4 sea-saw shaped?

  • #1
upload_2018-7-4_16-45-10.png

XeF4 exists in 2nd square planar form. However, my argument is why can't it be in the sea-saw shape(as shown in 1st diag.)?
In 2nd: Lone Pair-Lone pair interactions: 180°(1)
Bond Pair - Lone pair interactions: 90°(8)
In first: Lone Pair-Lone pair interactions: 90°(1) {Edited}
Bond Pair - Lone pair interactions: 90°(6), 180°(2)

Both sum up to be 9 interactions.
 

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  • #2
mjc123
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That's square planar, not trigonal. What do you know about the relative strengths of lone pair-lone pair, lone pair-bond pair and bond pair-bond pair interactions?
 
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  • #3
That's square planar, not trigonal. What do you know about the relative strengths of lone pair-lone pair, lone pair-bond pair and bond pair-bond pair interactions?
Ah. Thank you for pointing that out.
Basically, extent of repulsion:
LP-LP>BP-LP>BP>BP-BP
That's all I know regarding that.
 
  • #4
mjc123
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So why does it favour structure 2?
 

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