A. Whitaker
Oct 22, 2008
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Influential Citations
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Journal
Journal of The Society of Dyers and Colourists
Abstract
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.