A high-efficiency synthesis method for a latent pigment of red pigment diketo-\npyrrolo-pyrrole (Pig. Red 272:272DPP), which is important as a functional\norganic pigment, was investigated, and the investigation results revealed that\nirradiation of microwaves (MWs) for several seconds to 272 DPP in NMP\n(N-methyl-2-pyrrolidone) solvent yielded DPP latent pigment (272DPP-BOC)\nat a high yield of 86.2%. Two kinds of latent-pigment crystals, namely, red\nand yellow, were obtained by recrystallization, and it was found that the fluorescence-\nemission properties of the two kinds differ significantly. Single-\ncrystal X-ray structural analysis showed that the difference in the fluorescence-\nemission properties of the two types is derived from the difference in\ntheir crystal structures.
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