Synthesis of heteroleptic nickel(II) and palladium(II) dithiolenes

Abstract

Deprotection of 4-(p-cyanophenyl)-1,3-dithiole-2-thione, 4-(2-thienyl)-1,3-dithiole-2-one (1) and 4-(3-thienyl)-1,3-dithiole-2-one (2) with a base in MeOH or KOH and the posterior addition of nickel(II) and palladium(II) complexes give the formation of heteroleptic dithiolenes with 1,2-bis(diphenylphosphino)ethane, dppe, as an additional ligand. The X-ray analyses of two Pd-dithiolenes show a planar five-membered ring involving the metallic center and the dithiolene unit.