Synthesis of Pd3Tl and Pd6Tl2 Complexes Based on a Trinuclear Aryl–Palladium(II) Complex Acting as a Metallaligand Toward Thallium(I) Through Tl–Arene and Tl–I Bonds

The metallaligand [(PdIL2)3(C6Me3-1,3,5)] (L2 = 4,4′-di-tert-butyl-2–2′-bipyridine = tbbpy) reacts with TlOTf to afford the complex [{(PdIL2)3C6Me3-1,3,5}Tl]OTf, which exists in the solid state as a 2:1 mixture of monomer and dimer, both showing Tl(I)–I and Tl(I)−η6-mesitylene bonds. In solution, only the monomer is observed. Heating of toluene solutions of [(PdIL2)3(C6Me3-1,3,5)] affords the dinuclear complex [(PdIL2)2(C6HMe3-1,3,5)].