Synthesis and fluorine-19 nuclear magnetic resonance spectra of trifluoromethylthio-complexes of platinum, palladium, nickel, and iridium

Abstract

Oxidative addition reactions of (SCF₃)₂ to low oxidation state metal complexes and metathetical reactions of AgSCF₃ with metal halide complexes lead to the synthesis of the new complexes cis- and trans-[Pt(SCF₃)₂(PPh₃)₂], cis- and trans-[PtCl(SCF₃)(PPh₃)₂], trans-[PtH(SCF₃)(PPh₃)₂], trans-[PtH(SCF₃)(PEt₃)₂], cis-[PtCl(SCF₃)-(PEt₃)₂], cis- and trans-[Pd(SCF₃)₂(PPh₃)₂], trans-[PdCl(SCF₃)(PPh₃)₂], trans-[PdCl(SCF₃)(PEt₃)₂], trans-[Ni(SCF₃)₂(PPh₃)₂] and trans-[Ir(SCF₃)(CO)(PPh₃)₂]. ¹⁹F N.m.r. spectra of these complexes are described and used to assign the stereochemistry. The trans-influence of the SCF₃ ligand is discussed and the platinum–fluorine coupling constants in a series of SCF₃ complexes are used to establish a trans-influence series: H > PEt₃∼ PPh₃ > SCF₃ > Cl.