The interaction between [Pt(µ-Cl)(SafroIe-1H)]₂ and 1,3-diisopropylbenzimidazolium bromide in the presence of Ag₂O

Abstract

The interaction of the dimeric complex [Pt(µ-Cl)(Saf)]₂ (1) (Saf: deprotonatcd safrole) with the salt ͥPr₂-bimy HBr in the presence of Ag₂O in acetone solvent was studied. The obtained products were mixed complexes of [PtCl(Saf)( ͥPr₂-bimy)] (2) and [PtBr(Saf)( ͥPr₂- bimy)] (3) with different molar ratio (Pᵢ, Pᵢᵢ, Pᵢᵢᵢ) depending on the used molar ratio of 1:salt:Ag₂O. In the case of this ratio being 1 : 2 : 1.1. Pᵢ was obtained, which is a mixture of 2 and 3 at a 3 : 1 ratio. When concentration of the salt was increased, the product was Pᵢᵢ with the molar ratio of 2 : 3 at 1 : 3. However, when both the salt and Ag₂O were increased at the same time. 2 and 3 in Pᵢᵢᵢ had equal molar proportions. The two main factors affecting the 2 : 3 molar ratio are the different solubility of AgCl and AgBr, and the different coordinating ability of Cl⁻ and Br⁻ ligands. The structures of 2 and 3 were determined by ˡH NMR spectra and single crystal X-ray diffraction.