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The Polymorphism of C.I. Pigment Red 1
Author(s) -
Whitaker A.
Publication year - 1982
Publication title -
journal of the society of dyers and colourists
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 0037-9859
DOI - 10.1111/j.1478-4408.1982.tb03617.x
Subject(s) - polymorphism (computer science) , pigment , diffraction , crystallography , powder diffraction , chemistry , materials science , stereochemistry , optics , physics , organic chemistry , biochemistry , genotype , gene
The polymorphism of C.I. Pigment Red 1 (1‐[(4′‐nitrophenyl)‐azo] ‐2‐naphthol) in commercial samples has been investigated by interpreting their X‐ray diffraction patterns. These have been compared with each other and with those from three single‐crystal polymorphs (α, β and γ). It is concluded that commercial samples are predominantly of either one or two phases (α or γ). There is evidence that a fourth phase (δ) exists in powder form.