Positively charged Pd2 complexes of a new thiophenoxide-hinged binucleating ligand. The crystal and molecular structure of µ-{4-methyl-2,6-bis[2-(2-pyridyl-χN)ethylimino-χN-methyl]thiophenolato-1χS:2χS}-bis[dichloropalladium(II)] chloride–water–methanol (1/1/0.5)

Abstract

The Schiff-base condensation of 2-(N,N-dimethylcarbamoylthio)-5-methylisophthaldehyde with 2-(2-aminoethyl)pyridine, in the presence of Pd²⁺, gives the complex [Pd₂LCl₂]Cl·H₂O·0.5CH₃OH (1a), where L = 4-methyl-2,6-bis[2-(2-pyridyl)ethyliminomethyl]thiophenolate, and a monopalladium monoaldehyde complex, (2). The structure of (1a) was established by a single-crystal X-ray diffraction study: the crystals are monoclinic, space group Cc, with a= 24.186(4), b= 14.911(2), c= 15.299(2)Å, β= 104.87(1)°; refined to R= 0.026 for 5 067 reflections [I 3σ(I)] collected by counter methods. The structure of [Pd₂LCl₂]⁺ reveals two chloride ions at the exogenous bridging site of the complex, one bound to each palladium. Spectroscopy suggests an analogous structure for [Pd₂L(CH₃CO₂)₂]PF₆.