By Robert Christie
This e-book 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 amazing breadth of insurance begins with a dip into the heritage of color technology. "Colour Chemistry" then is going directly to examine the constitution and synthesis of a few of the dyes and pigments, in addition to their functions within the conventional parts of textiles, coatings and plastics, and likewise the ever-expanding diversity of "high-tech" purposes. additionally mentioned are a number of the environmental concerns linked to the manufacture and use of color. The wide and balanced insurance awarded during this booklet makes it perfect for college students and graduates. additionally, mant experts in or academia also will enjoy the assessment of the topic that's supplied. [part of the RSC Paperbacks sequence]
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Additional resources for Colour Chemistry (Rsc Paperbacks)
The bathochromicity of this dye ( 562 nm) is explained by the extensive stabilisation of the ﬁrst excited state as a result of resonance involving structures XIII—XV in which the negative charge is accommodated on the The Physical and Chemical Basis of Colour 33 nitrogen atoms of each of the three cyano groups in turn. The colour of dyes may be aﬀected by steric as well as electronic eﬀects. For example, a comparison of isomers 16e and 16f shows that an o-nitro group produces a signiﬁcantly smaller bathochromic shift than a p-nitro group.
They recognised that the chromophore is commonly an electron-withdrawing group, that auxochromes are usually electron-releasing groups and that The Physical and Chemical Basis of Colour 27 they are linked to one another through a conjugated system. In essence, the concept of the donor—acceptor chromogen was born. 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.
This series of volumes provides a comprehensive listing of the known commercial dyes and pigments and is updated on a regular basis. Each colorant is given a C. I. Generic Name, which incorporates its application class, the hue and a number, which simply reﬂects the chronological order in which the colorants were introduced commercially. It is extremely useful that this system of nomenclature for dyes and pigments is more or less universally accepted by all those involved in their manufacture and application, and so it is frequently used throughout this book.
Colour Chemistry (Rsc Paperbacks) by Robert Christie