Molecular structure and colour

LC4.5.1.1

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Description
Components of equipment sets

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	671 0340 4	Bromide/Bromate solution, 250 ml Danger H350
1	674 7920 4	Sulfuric acid, diluted, approx. 2 N (= 10 %), 500 ml Warning H290 H315 H319
1	673 8000 4	Sodium thiosulfate-5-hydrate, 100 g
1	675 3410 4	Water, pure, 5 l
1	665 754 4	Measuring cylinder 100 ml, with plastic base
1	664 154 4	Watch glass dish 80 mm Ø
1	665 212 4	Glass stirring rod 200 x 8 mm Ø
1	665 997 4	Graduated pipette 10 ml
1	666 003 4	Pipetting ball (Peleus ball)
1	602 022 4	Beaker Boro 3.3, 100 ml, squat
1	610 010 8	Laboratory safety goggles
1	667 609 4	Safety gloves, nitrile rubber, size 8

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Molecular structure and colour

Description

Components of equipment sets

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