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By Herbst W., Hunger K.

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D) Refinement by Rietveld analysis: Fitting of the crystal structure onto the powder diagram. Comparative three dimensional X-ray diffraction studies have been carried out on a red and a brown representative of the Naphthol AS pigment series, differing only by the presence or absence of one methoxy group in the anilide function of the coupling component (4). 2 Tinctorial Strength 17 The almost completely planar structure of the red pigment is distorted in the brown pigment by an additional methoxy group, which forces portions of the molecule out of the molecular plane.

Sec. 2), which are partially adsorbed on the fresh surface of a newly synthesized pigment crystal. Measurements may therefore reflect specific surface areas that appear smaller than the expected value. Frequently, large amounts of additives such as rosin are used in manufacturing highly transparent types of azo pigments for application in process color printing inks. Pigment particles that emerge from such a process are comparatively small, Because such resins tend to inhibit crystal growth [13].

Unserer Zeit 12 (1978) 1–11; further references ibid. S. Dähne, Z. Chem. 10 (1970) 133, 168; Science 199 (1978) Nr. 4334, 1163–1167. [2] P. Rys and H. Zollinger, Farbstoffchemie, 3. , Verlag Chemie, Weinheim, 1982; H. Zollinger, Color Chemistry, 2. , VCH Verlagsgesellschaft, Weinheim, 1991. [3] J. Fabian and H. Hartmann, Light Absorption of Organic Colorants, Springer-Verlag, Berlin, 1980. [4] J. Griffiths, Rev. Prog. Color. Vol. 11 (1981) 37–57. [5] J. Griffiths: Colour and Constitution of Organic Molecules, Academic Press, London, 1976.

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