Uncommon anionic dioxorhenium(V) and neutral monooxorhenium(V) mixed-ligand complexes containing heterofunctionalized phosphine ligands: syntheses and structural characterization

A series of six-coordinate mono- and dioxo complexes is produced from ligand-exchange reactions of the bidentate hybrid ligand (o-hydroxyphenyl)diphenylphosphine, POH, onto labile pentavalent rhenium precursors. The mono-substituted (ReOCl3(PO))- was found to be the key intermediate for the syntheses of three more types of bis-substituted compounds. Two of these, the anionic dioxo (ReO2(PO)2)- and neutral monooxo mixed-ligand (ReOX(PO)(PNH)) complexes, are two uncommon examples of coordination around the metal center.