Understand the two doubly degenerate mode of D4h symmetry

[Rajini]

Hello all,
This is not a homework problem. Just to understand the two doubly degenerate mode of D4h symmetry i wanted to make sample calculation. Pt in the middle of a square formed by 4 Cl atoms. PtCl₄ has square planar structure (AB₄) molecule.
1. What is the whole charge of PtCl₄ ? Is this $$-2$$ ?
2. Multiplicity of Pt ? Multiplicity = [2S+1] where S is spin state of Pt.
thanks.

 

[alxm]

That would naturally depend on which oxidation state of platinum you're interested in. But since the [PtCl₄]^2- ion is well-known, I'm assuming that's the one you want. It has a closed-shell singlet ground-state.

 

[Rajini]

Hello,
So multiplicity is 1? please give the number!
Because nobody knows about the vibrational picture of the partners of the two degenerate Eu modes. I need to find how it vibrates.