**2.1.1 The synthesis of the ligands - L1, L2, L3 and corresponding palladium(II) complexes – C1, C2, C3**

In 50 mL of dry alcohol (1-propanol, 1-butanol or 1-pentanol), saturated with gas HCl, 1.53 g (7.5 mmol) of H2-*S,S*-eddp was added and the mixture was refluxed for 12 h. The mixture was filtered and left in the refrigerator over night. The obtained white powder was filtered and air-dried.

Complexes were obtained by mixing K2[PdCl4] (0.200 g, 0.613 mmol) and equimolar amount of the dpr-*S,S*-eddp·2HCl·3H2O (**L1**) (0.2546 g, 0.613 mmol), dbu-*S,S*-eddp·2HCl·3H2O (**L2**) (0.2718 g, 0.613 mmol) or dpe-*S,S*-eddp·2HCl·2H2O (**L3**) (0.2780 g, 0.613 mmol) esters. During 2 h of stirring 10 cm3 of water solution of LiOH (0.0294 g, 1.226 mmol) was added in small portions to the reaction mixture. Within this period, pale yellow precipitates of the complexes **C1-C3** were obtained, filtered off, washed with cold water, ethanol and ether and air dried (Vasić et al., 2010) (Fig. 1.).
