Tag : Absorption Spectra

Effects of Substituents on the Absorption Spectra of molecules

Written by John Introduction: The objective of this lab was the observation of the effects of substituents on the absorption spectra of molecules (most specifically azulene). ChemDraw 3D was used to visualize the electron densities and energies of the HOMO and LUMO states of several molecules. Then, the absorption spectra of several chemicals—including azulene, mono-substituted azulenes, and poly-substituted azulenes—were obtained using spectrophotometers, and these absorption spectra were compared. These spectra allowed the explanation of shifts in HOMO and LUMO states […]