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Diarylide pigments are organic compounds that are used as pigments in inks and related materials. They often are yellow or yellow-green. To some extent, these organic compounds have displaced cadmium sulfide from the market. They exist as yellow powders of low solubility in water.〔K. Hunger. W. Herbst "Pigments, Organic" in ''Ullmann's Encyclopedia of Industrial Chemistry'', Wiley-VCH, Weinheim, 2012. 〕 == Production == The formation of these pigments involves the reaction of diazotized aromatic diamines (derivatives of benzidine) with coupling components, typically derivatives of acetoacetanilide. By varying both of these components, a wide variety of pigments have been produced.〔Lewis, D. M., Modern colorants synthesis and structure. Advances in color chemistry series, Vol. 3. Edited by A. T. Peters & H. S. Freeman, Blackie Academic & Professional, Glasgow, 1995, xii + 245 pp. ISBN 0 7514 0209 5. Journal of Chemical Technology & Biotechnology 1996, 65, (2), 207-208.〕 A related family of organic pigments are the simpler arylides, which arise from the coupling of monodiazonium salts with the same coupling partners. The molecular structures of these molecules is more conjugated than represented in the images shown below.〔Barrow, M. J.; Christie, R. M.; Monteith, J. E., The crystal and molecular structures of three diarylide yellow pigments, C. I. Pigments Yellow 13, 14 and 63. Dyes and Pigments 2002, 55, (2-3), 79-89.〕 The pigments' colors can range from yellow to green. One of the most common diarlyide yellow pigments is Pigment Yellow 12. Its CAS number is . Other diarylide yellow pigments include ‘’’yellow 13’’’ , ‘’’yellow 17’’’ and ‘’’yellow 83’’’ . These pigments share the same backbone and vary in color depending on substitution of the benzene rings. Worldwide production of color organic pigments was estimated to be about 250,000 metric tons (t) in 2006, with about 25%, or 62,500 t, being diarylide yellows.〔Savastano, D., The pigment report: although 2006 was a year of improvement, pigment manufacturers are coping with a wide variety of challenges, including raw material pricing and supply issues and overcapacity. Ink world 2007, March.〕 File:PigmentYellow13&34.png|Pigment Yellow 13 & 34 (R = H or Me) File:PigmentYellow83.png|Pigment Yellow 83 File:PigmentYellow81.png|Pigment Yellow 81 File:PigmentYellow17.png|Pigment Yellow 17 File:PigmentYellow14.png|Pigment Yellow 14 File: YellowPig5thTry.png |Pigment Yellow 16 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「diarylide pigment」の詳細全文を読む スポンサード リンク
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