Colour Wheel

For my chemistry notes I needed a colour wheel which can be used to work out the colour of a pigment or dye when the wavelengths at which light is absorbed are known or to work out the wavelengths that are absorbed on when the colour is known.

The opposite colour across the wheel is the complementary colour. A red pigment absorbs green light. A dye that absorbs yellow light appears violet.

I coloured in the diagram linked to below using gimp.

The original diagram

This continues my series of educational resources. Google did not find what I was looking for straight away, hopefully now it will.

Electrophilic substitution reactions of benzene and it derivatives

Following up on my organic reactions post here is a diagram of the Electrophilic substitution reactions of benzene and it derivatives
This diagram includes the reactions that turn benzene into chlorobenzene, bromobenzene, benzenesulphonic acid, cyclohexane, [alk]ylbenzene, phenyl[alk]anone, nitrobenzene -> phenylamine -> benzendiazonium chloride.

Files for download
exported: png, pdf, svg
source: odg (open office draw) , chemtool

Organic reactions

As part of my revision I have created a diagram showing all or almost all the organic reactions that link the organic molecules relevant to my course.
The molecules included in this web include amine, primary and secondary amides, primary, secondary and tertiary alcohols, ester, acyl chloride, carboxylic acid, aldehyde, ketone, alkane, alkene, nitrile and halogenoalkane.
This diagram is not perfect or complete and most definitely could be improved.
So I will attach all the source files as well as exported final versions.
exported: png, pdf, svg
source: odg (open office draw) , chemtool