Chem 1140; Spectroscopy UV-VIS IR NMR. UV-VIS Spectroscopy.

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Presentation transcript:

Chem 1140; Spectroscopy UV-VIS IR NMR

UV-VIS Spectroscopy

l = path length of the absorbing solution in [cm] c = concentration in moles/liter Log I 0 /I = absorbance or optical density = A  = molar extinction coefficient [1000 cm 2 mol -1 ]

MO Diagram of Ferrocene FeFeCp 2 2 Cp - Ferrocene has a molar extinction coefficient of 96 M -1 cm -1 at 442 nm

Nomenclature of Electronic Transitions; Symbols of Symmetry Classes Symbols of symmetry classes: A: sym. (according to a C n operation) B: antisym. (according to a C n operation) E: 2-fold degenerate state T: 3-fold degnerate state Indices: g: sym. (according to an inversion operation) u: antisym. (according to an inversion operation) 1: sym. (according to a C 2 axis that is orthogonal to a C n axis) 2: antisym. (according to a C 2 axis that is orthogonal to a C n axis) ‘: sym. (according to a plane of symmetry  n that is orthogonal to a C n axis) ‘: antisym. (according to a plane of symmetry  n that is orthogonal to a C n axis)

◦ Bonus Problem: Calculate UV and IR Spectra of Ferrocene and Acetylferrocene, and Compare to Experimental Data; can you design a Ferrocene derivative that is green- colored?

An Introduction to NMR Spectroscopy 1 H NMR 13 C NMR