TITLE:
High-Efficiency Synthesis and Properties of Latent Pigment Red 272DPP-BOC by Microwave Irradiation
AUTHORS:
Tomoji Ohishi, Yu Kimura, Kiyohiko Nakajima, Masayuki Watanabe, Noboru Aoyagi
KEYWORDS:
Latent Pigment, Diketopyrrolopyrrol, Pigment Red 272, High Efficiency Synthesis, Microwave Irradiation, Single-Crystal X-Ray Analysis
JOURNAL NAME:
Materials Sciences and Applications,
Vol.11 No.3,
March
10,
2020
ABSTRACT: A high-efficiency synthesis method for a latent pigment of red pigment diketo-pyrrolo-pyrrole (Pig. Red 272:272DPP), which is important as a functional organic pigment, was investigated, and the investigation results revealed that irradiation of microwaves (MWs) for several seconds to 272 DPP in NMP (N-methyl-2-pyrrolidone) solvent yielded DPP latent pigment (272DPP-BOC) at a high yield of 86.2%. Two kinds of latent-pigment crystals, namely, red and yellow, were obtained by recrystallization, and it was found that the fluorescence-emission properties of the two kinds differ significantly. Single-crystal X-ray structural analysis showed that the difference in the fluorescence-emission properties of the two types is derived from the difference in their crystal structures.