Dyes with High Dielectric Constants

Materials with high dielectric constants find wide application in electronic devices, for instance in capacitors, wave guides, and reflective materials for electromagnetic radiation. For very high dielectric constants materials with ion or dipole lattices are usually used, for example the dielectrics in tantalum capacitors. However, these materials have the disadvantage of a rather strong coupling of electrical charging to lattice vibrations. This mechanism can cause dielectric loss at high frequencies [ 11. Better results can be expected when the dielectrics consist of electrically neutral molecules with a low dipole moment. If they can be easily polarized, a high dielectric constant will result. Large conjugated rt systems are highly polarizable and form the basis of the chromophores in dyes. Therefore, electrically neutral dyes are especially suitable as dielectrics. The dielectric constants of perylene dyes 1, perylene3,4 : 9,10-tetracarboxylic bis-imides, are examined in this paper.