Organometallic nickel(II) complexes with dithiophosphate, dithiophosphonate and monothiophosphonate ligands

The Sulfur Rich Fluorothiophosphate Dianions [S5 P2 F2 ]2- and [S3 PF]2- : Cluster and Chelation Control of P-S Heterolysis

The sulfur rich difluoropentathiodiphosphate dianion [S₅ P₂ F₂ ]^2- , from fluoride addition to P₄ S₁₀ , has a somewhat checkered history and proves to be the main product of the reaction in acetonitrile. Its optimized synthesis, and structural characterization, as either a tetraphenylphosphonium or a tetrapropylammonium salt, [Nⁿ Pr₄ ]₂ [S₅ P₂ F₂ ] allows for the first coordination chemistry for this dianion. Reactions of [S₅ P₂ F₂ ]^2- with d¹⁰ metal ions of zinc(II), and cadmium(II), and d⁹ copper(II) resulted in a surprising diverse array of binding modes and structural motifs. In addition to the simple bis-chelate coordination of [S₅ P₂ F₂ ]^2- with zinc, cleavage of the P-S bond resulted in complexes with the unusual [S₃ PF]^2- fluorotrithiophosphate dianion. This was observed in two cluster complexes: a trinuclear cadmium complex with mixed [S₅ P₂ F₂ ]^2- /[S₃ PF]^2- ligands, [Cd₃ (S₅ P₂ F₂ )₃ (S₃ PF)₂ ]^4- as well as an octanuclear copper cluster, [Cu₈ (S₃ PF)₆ ]^4- which form rapidly at room temperature. These new metal/sulfur/ligand clusters are of relevance to understanding multimetal binding to metallothionines, and to potential capping strategies for the condensed nanoparticulate cadmium chalcogenide semiconductors CdS and CdSe.