Perylenetetracarboxylic dianhydride
Perylenetetracarboxylic dianhydride 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/cm3, 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.
