By Robert Christie
An up to date perception into the chemistry in the back of the colour of the dyes and pigments that make our global so colourful. The huge and balanced assurance offered during this booklet makes it perfect for college students and graduates.
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Extra info for Colour Chemistry
The reason for the diﬀerences arises from the fact that while compound 16f is a planar molecule, steric congestion forces compound 16e to adopt a non-planar conformation. This happens because the o-nitro group clashes sterically with the lone pair of electrons on one of the azo nitrogen atoms and is thus forced to rotate out of a planar conformation. It may be envisaged that this rotation takes place about the bond between the carbon atom of the aromatic ring and the nitrogen atom of the NO group.
The spectrum of the red surface, for example, shows low reﬂectance (high absorption) in the 400—500 nm (blue) and 500—600 nm (green) ranges, and high reﬂectance of the red wavelengths (600—700 nm). When colour is assessed on the basis of reﬂectance measurements, it is common to consider the three relevant attributes of perception of colour as hue, chroma (or saturation) which is the ‘colourfulness’ or richness of the colour, and lightness, which refers to the amount of reﬂected light. 5(a). The hue of a particular colour is represented in a colour circle.
For many of these applications, solubility in speciﬁc organic solvents rather than in water is of importance. In contrast, pigments are colouring materials that are required to be completely insoluble in the medium into which they are incorporated. The principal traditional applications of pigments are in paints, printing inks and plastics, although they are also used more widely, for example, in the coloration of building materials, such as concrete and cement, and in ceramics and glass. The chemistry of pigments and their application is discussed in more detail in Chapter 9.