Transition-metal periodato complexes. Their preparations and properties as catalytic oxidants, and X-ray crystal structure of Na 4 K[Au{IO 5 (OH)} 2 ]·KOH·15H 2 O

The preparations and properties as oxidants for alcohols, aldehydes and activated primary alkyl halides of [M{IO5(OH)}2]5–(M = Cu, Ag or Au), [M(OH)2{IO5(OH)}2]6–(M = Ni, Pd or Pt), trans-[MO2{IO5(OH)}2]6–(M = Ru or Os) and [M6O24I]5–(M = Mo or W) are reported. The X-ray crystal structure of Na4K[Au{IO5(OH)}2]·KOH·15H2O shows the gold atom to be square planar with co-ordination by two bidentate [IO5(OH)]4– ligands; the [Au{IO5(OH)}2]5– units are linked by NaO6 octahedra to form polymeric chains which are cross-linked by potassium ions.