Chem 1140 Spectroscopy UVVIS IR NMR UVVIS Spectroscopy

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 e = molar extinction coefficient [1000 cm 2 mol-1]

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

Nomenclature of Electronic Transitions; Symbols of Symmetry Classes Symbols of symmetry classes: A: sym. (according to a Cn operation) B: antisym. (according to a Cn 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 Cn axis) 2: antisym. (according to a C 2 axis that is orthogonal to a Cn axis) ‘: sym. (according to a plane of symmetry sn that is orthogonal to a Cn axis) ‘: antisym. (according to a plane of symmetry sn that is orthogonal to a Cn 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 greencolored?

An Introduction to NMR Spectroscopy 1 H NMR 13 C NMR http: //www. chem. ucla. edu/%7 Ewebspectra/