ChemInform Abstract: Synthesis and Thermolysis of Ammonium Salts of Two Lacuna Complex Cerium(IV) Heteropolytungstates.
Abstract
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ChemInform Abstract
Novel lacuna complex Ce(IV) heteropolytungstates, (NH4)10 [Ce(PW11O39)2]×12H2O (I) and (NH4)12 [Ce(SiW11O39)2]×7H2O (II), are synthesized and characterized by spectroscopic and chemical methods. Final product of the thermolysis of salt (I) at 580-700°C is a PW12O38.5 phase, stabilized by CeOx (x = 1.5—2), which undergoes a transformation at 870-900°C into a P2W18O59 phase containing traces of WO3 and CeO2. Complex (II) decomposes above 580°C with formation of simple oxides of tungsten, silicon, and cerium.
