Measurements were performed using mutually saturated distilled water and 1-octanol in a glass vial containing a magnetic stir bar. The synthesized products were dissolved in distilled water (or 1-octanol, depending on their water solubility) at chosen concentration corresponding to the values adopted for the phytotoxicity and aquatic toxicity tests (1 g per 1 dm 3 of octanol or water), and then proper amounts of the second solvent (octanol or water) were added. Two duplicate runs were also carried out with different solvent ratios: 2 cm 3 of 1-octanol and 4 cm 3 of water (2:1), 4 cm 3 of 1-octanol and 4 cm 3 of water (1:1) and 8 cm 3 of 1-octanol and 4 cm 3 of water (1:2). All vials have been shaken at constant temperature of 25 °C. All obtained samples were subsequently centrifuged after 24 h and the aqueous and octanolic phases were collected with a syringe. The concentrations of compounds in water and in 1-octanol were determined spectrophotometrically using a VWR ® UV-5300PC spectrophotometer (VWR International, Belgium) based on calibration curves made previously (at λmax = 235 nm for aqueous solutions, 236 nm for 1-octanolic solutions). Two repetitions of each measurement were performed in a specific solvent ratio (1:1, 1:2 and 2:1). Finally, the log KOW was calculated as the average of 6 results collected for each compound.