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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.
Structure
PTCDA consists of a perylene core to which two anhydride groups have been attached, one at either side. It occurs in two crystalline forms, α and β. Both have the P21/c monoclinic symmetry and a density of ca. 1.7 g/cm, which is relatively high for organic compounds. Their lattice parameters are:
Form
a
b
c
γ
α
0.374 nm
1.196 nm
1.734 nm
98.8°
β
0.378 nm
1.930 nm
1.077 nm
83.6°
Self-assembly and films
Use
The main industrial use of PTCDA is as a precursor to Rylene dyes.
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