The Unprecedented [S N O ] Anion in the Molecular Gold Complexes [Au Br (S N O ) ] and [Au Cl (S N O ) ](S O Cl ).

The reaction of hexachlorophosphazene, P N Cl , with SO and the gold halides AuCl and AuBr , respectively, leads to the new cyclic anionic tetramer, [S N O ] , which is coordinated to Au in the dimeric complexes [Au X (S N O ) ] (X=Cl, Br). The [S N O ] anion can be seen as the condensation product of two sulfate anions, [SO ] and two amidosulfate anions, [NH SO ] .