Abstract
Palladium(II) complexes of thiones having the general formula [Pd(L)(4)]Cl-2, where L = thiourea (Tu), methylthiourea (Metu), N,N'-dimethylthiourea (Dmtu), and tetramethylthiourea (Tmtu) were prepared by reacting K-2[PdCl4] with the corresponding thiones. The complexes have been characterized by elemental analysis, IR and NMR spectroscopy, and two of these, [Pd(Dmtu)(4)]Cl-2 center dot A 2H(2)O (1) and [Pd(Tmtu)(4)]Cl-2 (2), by X-ray crystallography. An upfield shift in the > C=S resonance of thiones in C-13 NMR and downfield shift in N-H resonance in H-1 NMR are consistent in showing sulfur coordination with palladium(II). The crystal structures of the complexes show a square-planar coordination environment around the Pd(II) ions with the average cis and trans S-Pd-S bond angles of 89.64A degrees and 173.48A degrees, respectively.