Understand the two doubly degenerate mode of D4h symmetry

In summary, the conversation discusses the doubly degenerate modes of D4h symmetry and the example of PtCl4 as a molecule with a square planar structure. The participants also mention the charge and multiplicity of Pt in this molecule and the possibility of a closed-shell singlet ground-state. There is also a mention of the vibrational picture of the partners of the two degenerate Eu modes and the need to find how they vibrate.
  • #1
Rajini
621
4
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 [tex]-2[/tex] ?
2. Multiplicity of Pt ? Multiplicity = [2S+1] where S is spin state of Pt.
thanks.
 
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  • #2


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


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.
 

1. What is D4h symmetry?

D4h symmetry is a type of symmetry found in molecules or other physical systems that have a square planar or cubic structure. It is characterized by four-fold rotational symmetry and four mirror planes of symmetry.

2. What are doubly degenerate modes in D4h symmetry?

Doubly degenerate modes in D4h symmetry refer to the two vibrational modes that have the same energy and are indistinguishable from each other. This means that these modes can be interchanged without changing the overall energy of the system.

3. How do I identify the doubly degenerate modes in D4h symmetry?

In D4h symmetry, the two doubly degenerate modes can be identified by their transformation properties under the symmetry operations. These modes transform in the same way under all symmetry operations and have the same symmetry labels.

4. What is the significance of the doubly degenerate modes in D4h symmetry?

The doubly degenerate modes in D4h symmetry play an important role in determining the overall vibrational spectrum of a molecule or system. They contribute to the overall symmetry and can affect the reactivity and stability of the system.

5. Can the doubly degenerate modes in D4h symmetry be observed experimentally?

Yes, the doubly degenerate modes in D4h symmetry can be observed experimentally through techniques such as infrared and Raman spectroscopy. These techniques can detect the vibrational frequencies of the modes and provide information about the symmetry and structure of the molecule or system.

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