Compound having one of the general structures I to V: where R 1, R 2, R 3, R 4, R 5 are selected from: -H, - (C 1 -C 12)-alkyl, -O-(C 1 -C 12)-alkyl, -O-(C 6 -C 20)-aryl, - (C 6 -C 20)-aryl, -S-alkyl, -S-aryl, halogen, -COO- (C 1 -C 12)-alkyl, -CONH-(C 1 -C 12)-alkyl, -CO-(C 1 -C 12)-alkyl, -CO-(C 6 -C 20)-aryl, -COOH, -OH, -SO 3 H, -CN, -NH 2, -N[(C 1 -C 12)- alkyl] 2; R 6, R 7, R 8, R 9, R 10, R 11, R 12, R 13, R 14, R 15, R 16, R 17, R 18, R 19, R 20, R 21 R 22, R 23, R 24, R 25, R 26, R 27, R 28 are selected from: -H, -(C 1 -C 12)-alkyl, -O-(C 1 -C 12)-alkyl, -O-(C 6 -C 20)-aryl, -(C 6 -C 20)-aryl, -S-alkyl, -S-aryl, halogen, -COO-(C 1 -C 12)-alkyl, -CONH-(C 1 -C 12)-alkyl, -CO-(C 1 -C 12)-alkyl, -CO-(C 6 -C 20)-aryl, -COOH, -OH, -SO 3 H, -NH 2, -N[(C 1 -C 12) - alkyl] 2; R 29, R 30, R 31, R 32, R 33 are selected from: -H, -(C 1 -C 12)-alkyl, -O-(C 1 -C 12)-alkyl, -O-(C 6 -C 20)-aryl, - (C 6 -C 20)-aryl, -S-alkyl, -S-aryl, halogen, -COO-(C 1 -C 12)-alkyl, -CONH-(C 1 -C 12)-alkyl, -CO-(C 1 -C 12)-alkyl, -CO-(C 6 -C 20) -aryl, -COOH, -OH, -SO 3 H, -NH 2, -N[(C 1 -C 12)- alkyl] 2; where the alkyl and aryl groups mentioned may be substituted as follows: substituted -(C 1 -C 12)-alkyl groups and substituted -(C 1 -C 12)-alkoxy groups may have one or more substituents, depending on their chain length; the substituents are each independently selected from -(C 3 -C 12)-cycloalkyl, - (C 3 -C 12)-heterocycloalkyl, -(C 6 -C 20)-aryl, fluorine, chlorine, cyano, formyl, acyl and alkoxycarbonyl; substituted -(C 6 -C 20)-aryl groups and -(C 6 -C 20)-aryl-(C 6 -C 20)-aryl groups may have one or more substituents, depending on the ring size; these substituents are each independently selected from -H, -(C 1 -C 12)-alkyl, -O-(C 6 -C 20)-aryl, -(C 6 -C 20)-aryl, -halogen -COO-(C 1 -C 12)-alkyl, - CONH-(C 1 -C 12)-alkyl, -(C 6 -C 20)-aryl-CON[(C 1 -C 12)-alkyl] 2, - CO-(C 1 -C 12)-alkyl, -CO-(C 6 -C 20)-aryl, -COOH, -OH, -SO 3 H, - SO 3 Na, -NO 2, -CN, -NH 2, -N[(C 1 -C 12)-alkyl] 2; and R 1 and R 5 are not tert-butyl, and at least one of the R 1, R 2, R 3, R 4, R 5 radicals is not -H, and if one of the R 1, R 2, R 3, R 4, R 5 radicals is phenyl, at least one of the four remaining radicals is not -H. R 1, R 2, R 3, R 4, R 5 are selected from: -H, - (C 1 -C 12)-alkyl, -O-(C 1 -C 12)-alkyl, -O-(C 6 -C 20)-aryl, - (C 6 -C 20)-aryl, -S-alkyl, -S-aryl, halogen, -COO- (C 1 -C 12)-alkyl, -CONH-(C 1 -C 12)-alkyl, -CO-(C 1 -C 12)-alkyl, -CO-(C 6 -C 20)-aryl, -COOH, -OH, -SO 3 H, -CN, -NH 2, -N[(C 1 -C 12)- alkyl] 2; R 6, R 7, R 8, R 9, R 10, R 11, R 12, R 13, R 14, R 15, R 16, R 17, R 18, R 19, R 20, R 21 R 22, R 23, R 24, R 25, R 26, R 27, R 28 are selected from: -H, -(C 1 -C 12)-alkyl, -O-(C 1 -C 12)-alkyl, -O-(C 6 -C 20)-aryl, -(C 6 -C 20)-aryl, -S-alkyl, -S-aryl, halogen, -COO-(C 1 -C 12)-alkyl, -CONH-(C 1 -C 12)-alkyl, -CO-(C 1 -C 12)-alkyl, -CO-(C 6 -C 20)-aryl, -COOH, -OH, -SO 3 H, -NH 2, -N[(C 1 -C 12) - alkyl] 2; R 29, R 30, R 31, R 32, R 33 are selected from: -H, -(C 1 -C 12)-alkyl, -O-(C 1 -C 12)-alkyl, -O-(C 6 -C 20)-aryl, - (C 6 -C 20)-aryl, -S-alkyl, -S-aryl, halogen, -COO-(C 1 -C 12)-alkyl, -CONH-(C 1 -C 12)-alkyl, -CO-(C 1 -C 12)-alkyl, -CO-(C 6 -C 20) -aryl, -COOH, -OH, -SO 3 H, -NH 2, -N[(C 1 -C 12)- alkyl] 2; substituted -(C 1 -C 12)-alkyl groups and substituted -(C 1 -C 12)-alkoxy groups may have one or more substituents, depending on their chain length; the substituents are each independently selected from -(C 3 -C 12)-cycloalkyl, - (C 3 -C 12)-heterocycloalkyl, -(C 6 -C 20)-aryl, fluorine, chlorine, cyano, formyl, acyl and alkoxycarbonyl; substituted -(C 6 -C 20)-aryl groups and -(C 6 -C 20)-aryl-(C 6 -C 20)-aryl groups may have one or more substituents, depending on the ring size; these substituents are each independently selected from -H, -(C 1 -C 12)-alkyl, -O-(C 6 -C 20)-aryl, -(C 6 -C 20)-aryl, -halogen -COO-(C 1 -C 12)-alkyl, - CONH-(C 1 -C 12)-alkyl, -(C 6 -C 20)-aryl-CON[(C 1 -C 12)-alkyl] 2, - CO-(C 1 -C 12)-alkyl, -CO-(C 6 -C 20)-aryl, -COOH, -OH, -SO 3 H, - SO 3 Na, -NO 2, -CN, -NH 2, -N[(C 1 -C 12)-alkyl] 2; and R 1 and R 5 are not tert-butyl, and at least one of the R 1, R 2, R 3, R 4, R 5 radicals is not -H, and if one of the R 1, R 2, R 3, R 4, R 5 radicals is phenyl, at least one of the four remaining radicals is not -H.