The anion [Tl2Se2]^2-, has been isolated. It has a butterfly-shaped structure co

Question

The anion [Tl2Se2]^2-, has been isolated. It has a butterfly-shaped structure consisting of a four-membered ring in which each thallium is bonded to two selenium atoms. There are no thallium-thallium bonds nor are there any selenium-selenium bonds. The anion belongs to point group C2v.

a) How many fundamental vibrations are expected from this anion?

b) Are the two selenium atoms chemically equivalent? Explain

c) Are the two selenium atoms magnetically equivilant? Explain

Thank you so much for your help!!!

Explanation / Answer

a) Six fundamental modes of vibrations are expected.

b) Yes. Two selenium atoms are chemically equivalent. Two Selenium atoms are homoleptic. For example, replace either one of the Se atom with some other atoms (i.e., S), you will end up getting the same molecule which shows both are symmetric. And If both are symmetric then two Se atoms will be Chemically equivalent.

c) Yes. Two selenium atoms are magnetically equivalent. Because both the Se atoms have same coupling relationship to the Tl atoms.

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