Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 11, Pages 2723-2728Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201806121
Keywords
1,4-diketopyrrolo[3,4-c]pyrrole; blue pigment; dimerization; latent pigment; tert-butyloxycarbonyl
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1,4-Diketopyrrolo[3,4-c]pyrroles (DPPs) constitute a class of hydrogen-bonded pigments covering a color range from yellow-orange to dark violet. We report facile dimerization of a Boc-substituted 3,6-dithienyl-DPP. The formed dimer shows brilliantly blue color as a result of the expansion of the chromophore. The soluble dimer acts as latent pigment and is converted to the corresponding pigment either via thermocleavage or acidic deprotection of the Boc groups. The synthesized pigment is characterized by high migrational stability in a polymer matrix and a clear blue color.
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