Perylenetetracarboxylic dianhydride (PTCDA) is an organic dye molecule and an organic semiconductor. It is used as a precursor to a class of molecules known as Rylene dyes, which are useful as pigments and dyes. It is a dark red solid with low solubility in aromatic solvents. The compound has attracted much interest as an organic semiconductor.
PTCDA consists of a perylene core to which two anhydride groups have been attached, one at either side. It occurs in two crystalline forms, ñ and ò. Both have the P2<sub>1</sub>/c monoclinic symmetry and a density of ca. 1.7 g/cm<sup>3</sup>, which is relatively high for organic compounds. Their lattice parameters are:
The main industrial use of PTCDA is as a precursor to Rylene dyes.