| abstract |
The use of cyclic compounds of the formula (I) n nwhere n is a number in the range from 1 to 7, n X-Y-Z, in each case independently of one another, is O—C═N, N═C—O, NR 5 —C═N, N═C—NR 5 , N + R 5 2 —C═N, N═C—N + R 5 2 , O—C═N + R 5 , N + R 5 ═C—O, S—C═N + R 5 , N + R 5 ═C—S, S—C═N, N═C—S, R 1 , R 2 and R 3 each independently are, for example, H or a substituent n or corresponding heterocyclic compounds in which at least one group —CR 1 ═, —CR 2 ═, CR 3 ═ is replaced by —N, n R 5 in each case independently are, for example, H or a substituent R 7 , in each case independently of one another, are H, C 1-12 -alkyl or C 6-12 -aryl, or metal complexes of the cyclic compounds or complexes of the cyclic compounds with mineral acids, chloride, sulfate, bisulfate, phosphate, hydrogen phosphate, nitrate, BF 4 − or methanesulfonate being present as opposite ions X − in the case of cationic cyclic structures, as light absorbers, materials for hole injection layers in OLEDs, light-emitting compounds in OLED, phase-transfer catalysts or synergistic agents for the dispersing of pigments or for optical data storage, is described. |