Complexation of (trimethylphosphine)gold(I) with Selenones

Abstract

Mixed ligand complexes of gold(I) with various selenones and Me 3 P, [Me 3 PAuSe=C<]Cl, have been prepared and characterized by elemental analyses, i.r. and n.m.r. methods. A decrease in the i.r. frequency of the >C=Se mode of selenones upon complexation is indicative of selenone binding to gold(I) via a selenone group. An upfield shift in 13 C-n.m.r. for the >C=Se resonance of selenones and downfield shifts in 31 P-n.m.r. for Me 3 P moiety are consistent with the selenium coordination to gold(I). The steric effect as well as the basicity of Me 3 PAu + plays a significant role in bonding with Se-containing ligands compared to the Et 3 PAu + and Ph 3 PAu + complexes.

Exploring the Coordination of Cyclic Selenoureas to Gold(I)

“…Selenoureas (SeUr) in particular have been used as ligands for species including iridium photocatalysts, iridium and rhodium polymerization catalysts, precursors to zinc selenides, and copper complexes of biological relevance. − The latter examples are particularly interesting, as different coordination geometries could be obtained: a 1:1 mixture of SeUr:[CuX] (X = Cl, Br, I) led to tetrameric [Cu 4 X 2 (μ-X) 2 (μ-SeUr) 4 ] complexes, while a 2:1 ratio allowed the isolation of trigonal-planar [CuX(SeUr) 2 ] species . In gold chemistry, a few examples of [AuCl(SeUr) 2 )] complexes are known, , as well as cationic [AuL(SeUr) 2 ] complexes. − …”