Gold(I) complexes with selenones and triphenylphosphine as ligands

Abstract

A number of mixed ligand complexes of gold(I) with various selenones and Ph 3 P, [Ph 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 gold(I) binding via a selenone group. An upfield shift in the 13 C-n.m.r. for the C@Se resonance of selenones and downfield shifts in 31 P-n.m.r. for the Ph 3 P moiety are consistent with the selenium coordination to gold(I). Available data in the literature suggest that PAAuASe type complexes are usually linear.

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. − …”