[joe900]

How will look like splitting of d-orbitals for platinum(II) and platinum(IV) complexes? Energy scheme...
Is this correct? : http://bouman.chem.georgetown.edu/S98/prob/prob10/IMG00010.GIF
Will it be like this for iridium (page 3)?
http://www.ceitec.cz/rp3-jctc-vicha/f1355

[Irlanur]

You are aware that this might depend on the ligands...?

[kriggy]

It doesnt matter that much for square planar complexes, it does matter for octahedral, however the metals in 6th row have higher energy difference between t2g and eg and the higher oxidation state also increases the difference so Its maybe (dont remember the exact numbers) 2-2,5 bigger if we add both effects compared to 4th row metals and not counting the ligand effects. So there is a huge chance that the Pt(IV) complex will be low spin

[Irlanur]

square planar complexes

which needs 4 Ligands. Of course we can say that Pt(II) complexes are usually square planar, but at least when students learn it we should state these things always explicitly.

[kriggy]

Well the splitting shown in the link is for square planar complex so I assumed we are talking about square planar complexes.
BTW I´ve never seen Pt(II) tetrahedral complex, are there any?