New PDF release: Colour Chemistry

By Robert Christie

ISBN-10: 0854045732

ISBN-13: 9780854045730

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 assurance provided during this ebook makes it perfect for college kids and graduates.

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Additional info for Colour Chemistry

Example text

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. One of the earliest observations of relevance was due to Graebe and Liebermann who, in 1867, noted that treatment of the dyes known at the time with reducing agents caused a rapid destruction of their colour.

12 Reduced steric congestion with substituents ortho to the azo group in the case of a five-membered ring compared with a six-membered ring 36 Chapter 2 near-infrared region of the spectrum, showing a of 778 nm in dich
 loromethane. The extreme bathochromicity of this dye may be explained by a combination of the effects discussed throughout this section, including the extended conjugation, the influence of the thiazole ring and the maximising of both the electron donor (dialkylamino, acylamino, methoxy) and electron accepting (cyano, sulfone, chloro) effects in appropriate parts of the molecule.

The absorption band of aminoazobenzenes may be shifted to very long wavelengths to produce blue dyes by incorporating a number of electronwithdrawing groups into the acceptor ring and a number of electronreleasing groups into the donor ring. 10 Valence-bond (resonance) approach to the structure of compound 16e. 34 Chapter 2 methoxy) in the other. Alternatively, particularly bathochromic azo dyes that are structurally analogous to the aminoazobenzenes may be obtained by replacement of the carbocyclic acceptor ring with a five-membered aromatic heterocyclic ring.

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Colour Chemistry by Robert Christie

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