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is there a way to predict if a complex ion is tetrahedral or planar? Watch

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    Those with coordination number 4 can be either of the both so how to tell?
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    Calculating crystal field stabilisation energy usually gives the correct answer.
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    (Original post by alow)
    Calculating crystal field stabilisation energy usually gives the correct answer.
    Is that alevel chemistry?
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    (Original post by thebrahmabull)
    Those with coordination number 4 can be either of the both so how to tell?
    Maybe its to do with the number of atoms its bonded to. If its bonded to 2 or 3 it is planar and if 4 then its tetrahedral.
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    (Original post by Xenon17)
    Maybe its to do with the number of atoms its bonded to. If its bonded to 2 or 3 it is planar and if 4 then its tetrahedral.
    Nope. Coordination number 4 means 4 coordinate bonds are made with central atom/ion.
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    (Original post by thebrahmabull)
    Those with coordination number 4 can be either of the both so how to tell?
    cisplatin is square planar, thats the only one I have seen that is!

    (Cu(Cl)4)2- is Tetrahedral
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    (Original post by thebrahmabull)
    Is that alevel chemistry?
    Nope. There's no way to predict the shapes from A Level content.

    (Original post by Xenon17)
    Maybe its to do with the number of atoms its bonded to. If its bonded to 2 or 3 it is planar and if 4 then its tetrahedral.
    That's called hapticity, and until you learn more it'll be difficult to make predictions from it.

    Crystal field theory is the way to go tbh.
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    not really seen any other square planar complex ions; maybe just google them
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    I think the only square planar complex ion in A Level is platin. Rest are probably all tetrahedral
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    (Original post by alow)
    Nope. There's no way to predict the shapes from A Level content.



    That's called hapticity, and until you learn more it'll be difficult to make predictions from it.

    Crystal field theory is the way to go tbh.
    OK thanks
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    Platinum and nickel 4 coordinate complexes usually form planar geometry, beyond a level you would use ligand field stabilisation energy, andeven then its difficult, but you definitely don't need to know about that. Just remember nickel and platinum
 
 
 
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