4Miscellaneous Pigments
This chapter lists pigments that, either for reasons of different chemical structure or for lack of knowledge thereof, are not included in Chapters 2 or 3 of this book.
4.1 Triarylcarbonium Pigments
As a class, these pigments share the triarylcarbonium structure. At least two of the aryl moieties carry amino groups, which act as electron-donating substituents.
The compounds are therefore basic and thus capable of combining with acids to form insoluble salts, which is the form in which they can be applied as pigments.
Triarylcarbonium compounds can be described by several mesomeric structures, either in quinoid form with an ammonium ion or by a benzenoid structure with a carbonium ion:
For reasons of molecular symmetry, ...
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