Pentacene

Black solid

Fixed

1.35 g · cm -3

271 ° C

Insoluble in water, sparingly soluble in organic solvents

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Pentacene ( C22H14 ) is a polycyclic aromatic hydrocarbon with five linearly fused benzene rings. Structurally closely related to pentacene is quinacridone.

Properties

In pure form, pentacene forms deep blue crystals, which are however very sensitive to oxidation. With increasing pollution, pentacene is colored purple. From 300 ° C, a decomposition is observed in the presence of air. The compound crystallizes in the triclinic crystal system. The vapor pressure function is obtained after August according to log ( P) = A / T B (P in Torr T in K) A = 18867, and B = 35.823 in the temperature range of 171 ° C to 212 ° C. The solubility at 20 ° C in amount of chloroform 0.21 g of · L-1 in tetrahydrofuran, 0.11 g · l-1, in N, N -dimethylformamide, 0.1 g · l -1 and 0.18 g of toluene · l -1.

Application

Applies pentacene as an organic electronic material. It is an organic semiconductor and is used, inter alia, for organic thin-film field effect transistors. For these purposes, it is usually thermally evaporated. Another way is the coating of a solution, for example by spin coating. Since pentacene is virtually insoluble in all common solvents, Pentacenderivate be brought into solution and chemically transformed after coating.