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Polymorph of a Latent Pyrrolopyrrole Pigment: 1,4-Diketo-3,6-Diphenyl-Pyrrolo-[3,4-c]-Pyrrole

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The title compound is a soluble precursor (“latent pigment”) of diketopyrrolopyrrole pigment (DPP) that can be used for electronic and imaging applications. Two crystal forms (α & β) are known to exist in powders. Therefore, an attempt has been made in the present investigation to carry out full structure analysis on single crystals of both modifications. In the α-form, there are two independent molecules (A & B) characterized by C 1 and C i symmetriesrespectively, and the space group P21/n. The molecules are stacked in the sequence of –A-A-B-A-A-B- … in a fashion “herringbone”. On the other hand, the β-form crystallizes in the space group of P21/C and the molecule belongs to C 1 symmetry. The molecules are stacked along the α-axis relative to each other in a parallel arrangement.
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Document Type: Research Article

Publication date: January 1, 2003

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