Molecular structure and colour

LC4.5.1.1

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Description

In this experiment, the relationship between molecular structure and colourfulness is illustrated by using the example of the dye lycopene. The red dye of the tomato is a long-chain molecule with a conjugated π-electron system. In this experiment, bromine adds to double bonds of the dye molecule, causing a shift in the wavelength range in which the π-electron system absorbs light.

Components of equipment sets

1	6710340 4	Bromide/Bromate solution, 250 ml Danger H350
1	6747920 4	Sulfuric acid, diluted, approx. 2 N (= 10 %), 500 ml Warning H290 H315 H319
1	6738000 4	Sodium thiosulfate-5-hydrate, 100 g
1	6753410 4	Water, pure, 5 l
1	665754 4	Measuring cylinder 100 ml, with plastic base
1	664154 4	Watch glass dish 80 mm Ø
1	665212 4	Glass stirring rod 200 x 8 mm Ø
1	665997 4	Graduated pipette 10 ml
1	666003 4	Pipetting ball (Peleus ball)
1	602022 4	Beaker Boro 3.3, 100 ml, squat
1	610010 8	Laboratory safety goggles
1	667609 4	Safety gloves, nitrile rubber, size 8

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Molecular structure and colour

Description

Components of equipment sets

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