Higher Secondary Education

• V1 Isomerisations of E- and Z-azobenzene on a thin layer chromatography foil under irradiation with a day light projector and on a warm hotplate
  Warning: The compound azobenzene is not allowed in (german) schools, therefore the experiment can only be recommended as a video. The video follows the experimental instructions outlined in the 2016 reference (in German) below.
• V2 Isomerisations of E- and Z- dihydrodibenzodiazocin in solution and under irradiation with violet and green light from LEDs.

Technical Contents

Structure and properties of Z- and E-isomers (configuration, polarity, stability, solubility), energy diagrams for the thermical and the photochemical reaction pathway; molecular switches containing Z-E-azobenzene components

Scope

Z-E (cis-trans) isomerisation; energetics (thermal activation energy E_a; vs. photochemical excitation energy E = h∙ν; (MO model of the ϖ bond if applicable) (higher secondary education)