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.