Compound having the general structure IV: where R 9, R 10, R 11, R 12, R 13, R 14, R 15, R 16, R 17, R 18 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 9 ', R 10 ', R 11 ', R 12 ', R 9 ", R 10 ", R 11 ", R 12 " are selected from: -H, -(C 6 -C 20)-aryl; 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 or 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 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, -NH2, -N[(C 1 -C 12)-alkyl]2. R 9, R 10, R 11, R 12, R 13, R 14, R 15, R 16, R 17, R 18 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 9 ', R 10 ', R 11 ', R 12 ', R 9 ", R 10 ", R 11 ", R 12 " are selected from: -H, -(C 6 -C 20)-aryl; 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 or 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 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, -NH2, -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 or 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 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, -NH2, -N[(C 1 -C 12)-alkyl]2.