Combinatorial color generation with mixtures of dithienyl photochromes

The open–closed interconversion of four photochromes, including their photochemical interconversion kinetics and their use in multicolor systems based on multicomponent mixtures, is presented. The Figure shows a picture prepared with three dithienyl photochromes in closed form on a thin-layer chromatography plate after exposure to UV light for 2 min (left) and subsequently to daylight for 12 h (right). © 1999 WILEY-VCH Verlag GmbH, Weinheim, Fed. Rep. of Germany