Synthesis, molecular structure and reactivity of cis-[Pd(C6F5)2(C6H5CH2NMe2-κC1, κN)] a compound displaying an unusual η1 arene–palladium interaction

Abstract

The reaction between cis-[Pd(C₆F₅)₂(thf)₂](thf = tetrahydrofuran) and benzyldimethylamine rendered cis-[Pd(C₆F₅)₂(C₆H₅CH₂NMe₂-κC¹,κN)]1, a four-co-ordinate compound containing an unusual η¹arene–palladium interaction with the benzyldimethylamine acting as a bidentate chelating ligand. Complex 1 reacts with acetone, acetonitrile, dimethyl sulfoxide or CO (L) to yield cis-[Pd(C₆F₅)₂(NMe₂CH₂C₆H₅)(L)]2–5 respectively, which do not have a η¹ arene–palladium interaction. The reaction of 1 with Br^–or SPMe₂Ph (L′)(molar ratio 1:1) produced the complete displacement of the amine and the formation of [(F₅C₆)₂Pd(µ-L′)₂Pd(C₆F₅)₂]^n–(n= 2 or 0), and with Cl^–(molar ratio 1:1) a mixture of complexes is formed. The crystal structures of compounds 1and 2 have been determined.