Study on the interaction between [Pt(µ-CI)(isopropyl eugenoxyacetate-1H)]₂ and 1,3-diisopropylbenzimidazolium bromide

Abstract

The interaction between the dinuclear chelate ring complex [Pt(µ-Cl)(ⁱPrEug)]₂ (1) (ⁱPrEug: deprotonated isopropyl eugenoxyacetate) and l,3-diisopropylbenziniidazolium bromide (ⁱPr₂-bimy.HBr) has been studied for the first time. The result shows that the chloride bridges in 1 are easily cleaved by the ⁱPr₂-bimy in the present of base to form a mixture (Phh) oftwo complexes [PtBr(ⁱPrEug)(ⁱPr₂-bimy)] (2) and [PtCl(ⁱPrEug)(ⁱPr₂-bimy)] (3), and the molar ratio of 2:3 in Phh depends on the used base Ag₂O or Na₂CO₃/NaOOCCH₃/NaHCO₃/NaOH. The reaction of Phh with NaBr afforded complex 2 with high yield. The structure of 2 was determined by weight method, ESI-MS, IR, ¹H NMR, ¹³C NMR, HSQC spectroscopies and single-crystal X-ray diffraction. The NMR and XRD studies also reveal that the introdution of ⁱPr₂-bimy leads to a weakening of the Pt-(C9=C10) bond and strengthening of the Pt-C5 bond in 2.