In situ investigations of the polyoxometalate Trojan Horse compound K7Na[WVI18O56(SO3)2(H2O)2][middle dot]20H2O under high temperature and high pressure conditions

Abstract

We have used Raman and IR spectroscopy to study the oxidation reaction of sulfite groups in the unique polyoxometalate compound K7Na[W VI18O56(SO3)2(H 2O)2]·20H2O with a structure related to the Wells-Dawson type in situ at high temperature and high pressure. The results give new insights into the unusual redox process that occurs in this compound with electrons and O2- ions transferred between the polyoxometalate cluster and SO32-/SO42- groups held within the cage in a process that has been termed the "Trojan Horse" effect. © 2010 The Royal Society of Chemistry.