Palladium(II) complexes of benzaldehyde and 2-hydroxybenzaldehyde-4-H/phenyl-<Emphasis Type="Italic">S</Emphasis>-ethyl/allyl-thiosemicarbazones

The thiosemicarbazone derivatives R₁-C₆H₄-CH=N-N=(C-S-R₂)-NH-R₃ R₁ = H, OH; R₂ = H, Ph; R₃ = C₂H₅, C₃H₅] were prepared by a modified general method. The Pd(II) complexes of the thiosemicarbazone ligands L^I–VI were isolated in the compositions Pd(L)Cl₂], Pd(L)Cl] and Pd(L)₂]. The 1: 1 and 1: 2 metal complexes have non-ionic character, and the compounds were characterized by analytical data and infrared and proton resonance spectroscopy. The cis-trans and syn-anti isomers of the thiosemicarbazones were determined by means of ¹H NMR, and the coordination behavior of the polydentate thiosemicarbazone ligands towards the palladium ion were discussed.