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Photo – Mol (Photons and Molecules)

Target audience

  • Chemistry teachers for lower and higher secondary education
  • Students with the goal of becoming chemistry teachers


The experimental kit contains equipment for the following experiments

  • Part I: Photoluminescence

    • Color by absorption and emission of light
    • Luminescent colors by fluorescence and phosphorescence in solution and solids

  • Part II: Photochromism

    • „Intelligent materials“ with molecular switches
    • Photochromism and solvatochromism

  • List of all experiments


The kit also comes with

  • Accompanying booklet (in German) with 23 work sheets for the lower secondary (7 ws) and higher secondary education (16 ws), didactical tips (contects, basic concepts, skills and curricular integration) as well as risk assessments for all the experiments that are described in the booklet
  • an USB stick containing the contents of the accompanying booklet, interactive animations as well as the solutions to the work sheets

Listing and short description of the experiments described on the work sheets

Experiments for the part on photoluminescence, lower secondary education

Crying Chestnut BranchInvestigation of the fluorescence phenomenon in nature
Investigation of more plantsFluorescence is not an isolated case in nature
Fluoresceine in SolutionPreparation of a fluoresceine solution
Influence of concentrationSelf quenching of fluoresceine if it's concentration is too high, the increase in concentration results in an unespected effect for the students
Investigation of every day objectsInvestigation of fluorescence in every day objects
Banana under UV lightInvestigations of more fluorescence phenomenons and documentation of a long-term experinet.
Preparation of a phosphorescent sample using esculinMelting of tartaric acid, addition of esculin and distribution of the molten substance on the surface of the test tube

Experiments for the part on photoluminescence, higher secondary education

Fluoresceine in aqueous solution and with addition of acetoneQuenching of fluorescence by aggregation in aceton in contrast to water.
Fluoresceine in different pH valuesInfluence of the pH value on the strength of fluorescence of fluoresceine
Esculin in different pH valuesInfluence of the pH value on the strength of fluorescence of Esculin.
Preparation of phosphorescent sample using esculin using esculin and fluoresceine respectivelyMelting of tartaric acid, addition of esculin or fluoresceine respectively, and distribution of the molten dubstance on the glas of the test tube
Investigation of the phosphorescent samples in different temperaturesInfluence of temperature on phosphorescence: occurence and duration
Real color emission spectraSeparation of light emitted by an object into its spectral colors; additive mixing of colors

Experiments for the part on photochromism, lower secondary education

Investigation of the intelligent foilPhotosensitivity of the foil, concept of a negative image, creation of images
Investigation of the intelligent foil using various light sourcesOnly certain parts of the light can cause the intelligent foil to turn blue

Experiments for the part on photochromism, higher secondary education

Powering a photochemical reaction with lightOnly light of suitable wavelength can power phorochemical reactions, relation wavelength/light color/energy
Temperature dependenceThe speed of a thermal isomerisation depends on temperature, the speed of a photochemical isomerisation is independent from temperature.
Photosteady stateOn irradiation with light a different equilibrium is reached that is upheld by continuoous irradiation
SolvatochromismThe wavelength of light absorbed by merocyanine depends heavily on the solvent