Palladium(II) complexes of benzaldehyde and 2-hydroxybenzaldehyde-4-H/phenyl-S-ethyl/allyl-thiosemicarbazones

Abstract

The thiosemicarbazone derivatives R(1)-C(6)H(4)-CH=N-N=(C-S-R(2))-NH-R(3) [R(1) = H, OH; R(2) = H, Ph; R(3) = C(2)H(5), C(3)H(5)] were prepared by a modified general method. The Pd(II) complexes of the thiosemicarbazone ligands LI-VIsupercript stop were isolated in the compositions [Pd(L)Cl(2)], [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 of1supercript stopH NMR, and the coordination behavior of the polydentate thiosemicarbazone ligands towards the palladium ion were discussed.