Today in Inorganic…. 1.Happy Oh 1.Inhuman Transformations 2.Symmetry and Chirality 3.Introducing: Character Tables 5. Symmetry and Vibrational Spectroscopy.

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Presentation transcript:

Today in Inorganic…. 1.Happy Oh 1.Inhuman Transformations 2.Symmetry and Chirality 3.Introducing: Character Tables 5. Symmetry and Vibrational Spectroscopy Previously in Inorganic Chemistry ….. 1. How to Assign Point Groups “the flowchart” 2. Classes of Point Groups Still learning how to see differently…..

C4C4 C4C4 C4C4 C3C3 C3C3

C3C3

C4C4 C4C4 C3C3 C3C3

C4C4 C4C4 C4C4 C3C3 C3C3

C3C3 C 4 is now destroyed!

OhOh

5 types of symmetry operations. Which one(s) can you do?? Rotation Reflection Inversion Improper rotation Identity

Chirality What is it?? How do you look for it? Is this molecule chiral?It’s mirror image… Is super-imposible!! NO! – it is not chiral.

Chirality: dissymmetric vs. asymmetric

Chirality: Dissymmetric: having a non-superimposible mirror image (dissymmetric = chiral) vs. Asymmetric: without any symmetry (has C 1 point symmetry)

Chirality as defined through Symmetry: A Dissymmetric molecule has no S n axis. Is this contradictory to what you learned in Organic Chemistry? NO because: a S 1 axis = mirror plane a S 2 axis = inversion center

Chirality as defined through Symmetry: A Dissymmetric molecule has no S n axis. These molecules: do not have mirror symmetry do not have an inversion BUT they are not chiral because they have a S 4 axis.