SOS: The first coordination compound containing polysulfate ligands was obtained under harsh conditions from the reaction of K2[PdCl 4] and SO3. The compound contains a Pd2+ ion coordinated by two chelating tetrasulfate anions (see structure, Pd red, S yellow, O blue), which leads to a significant stabilization of the polysulfate anions compared to their uncoordinated analogues. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.