Results are out! Find what you need...fast. Get quick advice or join the chat
x

Unlock these great extras with your FREE membership

  • One-on-one advice about results day and Clearing
  • Free access to our personal statement wizard
  • Customise TSR to suit how you want to use it

shapes of complex ions

Announcements Posted on
Rate your uni — help us build a league table based on real student views 19-08-2015
  1. Offline

    ReputationRep:
    Is there any CORRECT way of deciding whether a complex ion of coordination no. 4 will have a square planar or a tetrahedral structure?


    I read in my book the shape of a complex ion, with 4 (unidentate) ligands, depends on whether the d orbitals are complete or not.

    Then it states, a transition metal with a coordination no. of 4, and a COMPLETE d subshell has a tetrahedral structure- and it uses cobalt as an example.

    How does Cobalt have a complete d-subshell?? Co---> [Ar] 3d7 4s2
    Co^(2+)---> [Ar] 3d7
    Co^(3+)---> [Ar] 3d6

    Is there a discrepancy or am I just high??
    :confused:
  2. Offline

    ReputationRep:
    (Original post by poopypie)
    Is there any CORRECT way of deciding whether a complex ion of coordination no. 4 will have a square planar or a tetrahedral structure?


    I read in my book the shape of a complex ion, with 4 (unidentate) ligands, depends on whether the d orbitals are complete or not.

    Then it states, a transition metal with a coordination no. of 4, and a COMPLETE d subshell has a tetrahedral structure- and it uses cobalt as an example.

    How does Cobalt have a complete d-subshell?? Co---> [Ar] 3d7 4s2
    Co^(2+)---> [Ar] 3d7
    Co^(3+)---> [Ar] 3d6

    Is there a discrepancy or am I just high??
    :confused:
    Rule of thumb: 4-coordinate = tetrahedral

    Exceptions: some d8 complexes (PtCl4, NiCl4)

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: March 30, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

New on TSR

Rate your uni

Help build a new league table

Poll
Do you prefer exams or coursework?
Study resources
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.