By Robert Christie
An updated perception into the chemistry at the back of the colour of the dyes and pigments that make our global so colourful. The vast and balanced insurance awarded during this booklet makes it excellent for college kids and graduates.
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This publication presents an up to date perception into the chemistry at the back of the color of the dyes and pigments that make our global so vibrant. The extraordinary breadth of assurance starts off with a dip into the historical past of color technology. "Colour Chemistry" then is going directly to examine the constitution and synthesis of some of the dyes and pigments, besides their functions within the conventional components of textiles, coatings and plastics, and likewise the ever-expanding diversity of "high-tech" functions.
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Additional info for Colour Chemistry
Disperse Blue 339, 18, a bright blue dye which contains a thiazole ring and gives a of 590 nm and thiophene derivative 19 which gives a of 614 nm. A number of reasons for the particular bathochromicity of heterocyclic azo dyes of this type may be postulated from the valence-bond approach. 11 The ﬁrst reason involves a consideration of aromatic character. e. a loss of resonance stabilisation energy. It is generally accepted that ﬁve-membered ring heterocyclic systems of this type are less aromatic than benzene derivatives.
The loss of resonance stabilisation energy on electronic excitation of dyes such as 18 is therefore less than in the corresponding carbocyclic systems and, as a consequence, the diﬀerence in energy between the ground and excited states is less. Steric eﬀects also play a part in the explanation. 11) illustrates that the heterocyclic nitrogen atom can eﬀectively act as an electron-withdrawing ortho-substituent with no associated steric eﬀect that might otherwise tend to reduce the bathochromicity.
20 Chapter 2 related to the area under the absorption band, it is important to treat its relationship with the molar extinction coeﬃcient as qualitative and dependent to a certain extent on the shape of the absorption curve. The third attribute, brightness, may be described in various other ways, for example as brilliance or vividness. This characteristic of the colour depends on the absence of wavelengths of transmitted light other than those of the hue concerned. Electronic absorption bands of molecular compounds are not inﬁnitely narrow because they are broadened by the superimposition of numerous vibrational energy levels on both the ground and excited electronic states.