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By Robert Christie

This ebook presents an updated perception into the chemistry at the back of the color of the dyes and pigments that make our international so vibrant. The extraordinary breadth of insurance begins with a dip into the heritage of color technological know-how. "Colour Chemistry" then is going directly to examine the constitution and synthesis of many of the dyes and pigments, besides their purposes within the conventional components of textiles, coatings and plastics, and likewise the ever-expanding diversity of "high-tech" functions. additionally mentioned are the various environmental matters linked to the manufacture and use of color. The wide and balanced insurance offered during this e-book makes it excellent for college students and graduates. moreover, mant experts in or academia also will enjoy the evaluate of the topic that's supplied. [part of the RSC Paperbacks sequence]

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Colour Chemistry (Rsc Paperbacks)

This booklet offers an updated 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 insurance begins with a dip into the background of color technology. "Colour Chemistry" then is going directly to examine the constitution and synthesis of a number of the dyes and pigments, besides their purposes within the conventional components of textiles, coatings and plastics, and in addition the ever-expanding variety of "high-tech" functions.

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E. a shift of the absorption band to longer wavelength, might be obtained by increasing the electron-withdrawing power of the chromophore, by increasing the electron-releasing power of the auxochromes and by extending the length of the conjugation. The chromophore and auxochrome theory, which was first proposed more than 100 years ago, still retains some merit today as a simple method for explaining the origin of colour in dye molecules although it lacks rigorous theoretical justification. The most important chromophores, as defined in this way, are the azo (—N —— N—), carbonyl (C —— O), methine (—CH —— ) and nitro (NO ) groups.

It is clear, at least in this case, that the valence-bond method is inferior to the molecular orbital approach. 14. 8, would suggest that a decrease in charge density on the amino nitrogen atom and an increase in charge density on the -nitrogen of the azo group would be observed on excitation. 14 Some -electron charge density differences between the ground and first excited states calculated by the PPP-MO method for 4-aminoazobenzene, 15c. 42 Chapter 2 group, an effect which may not be accounted for using the valence-bond approach.

In addition, an understanding of colour and constitution relationships has always been of critical importance in the design of new dyes. In the very early days of synthetic colour chemistry little was known about the structures of organic molecules. However, following Kekule´’s proposal concerning the structure of benzene in 1865, organic chemistry made significant and rapid progress as a science and, almost immediately, theories concerning the influence of organic structures on the colour of molecules began to appear in the literature.

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