# Understand the two doubly degenerate mode of D4h symmetry

1. ### Rajini

601
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.

Last edited: May 3, 2010
2. ### alxm

1,845
Re: platinum-chlorine

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.

3. ### Rajini

601
Re: platinum-chlorine

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.