Many azo-pigments are historical, that is they are no longer available commercially, but were available during a limited time range. Because many have not been characterized by modern analytical techniques, we synthesized a series of azo-pigments, specifically members of the pigment classes Arylide yellow (Hansa, PY49, PY98 and PY203), Diarylide yellow and orange (PY113, PY124, PO14 and PO15), and the red Naphthol AS (PR11 and PR19). The pigments were characterized through Infrared and Raman spectroscopy, and Laser Desorption Ionization (LDI) mass spectrometry. Synthesis will be outlined in the context of the utility of these reactions for undergraduate laboratory synthesis and characterization.

Historical pigments: Expanding scope, increased possibilities

255th National Meeting (2018)

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