Evidence of quasi-intramolecular redox reactions during thermal decomposition of ammonium hydroxodisulfitoferriate(III), (NH4)2[Fe(OH) (SO3)2]•H2O

Tünde Kocsis, József Magyari, István E. Sajó, Tibor Pasinszki, Zlotán Homonnay, Imre M. Szilágyi, Attila Farkas, Zoltán May, Herta Silvia Effenberger, Sándor Szakáll, Rajendra P. Pawar, László Kótai (Korresp. Autor*in)

Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

Abstract

Synthesis of ammonium hydroxodisulfitoferriate(III) , (diammonium catena- {bis(µ2- sulfito- O, O) - µ2- hydroxo- 2O} ferrate(III) monohydrate) (NH4) 2[Fe(OH) (SO3) 2] ·H2O (compd. 1) and its thermal behavior is reported. The compd. is stable in air. Its thermal decompn. proceeds without the expected quasi- intramol. oxidn. of sulfite ion with ferric ions. The disproportionation reaction of the ammonium sulfite, formed from the evolved NH3, SO2 and H2O in the main decompn. stage of 1, results in the formation of ammonium sulfate and ammonium sulfide. The ammonium sulfide is unstable at the decompn. temp. of 1 (150 °C) and transforms into NH3 and H2S which immediately forms elementary sulfur by reaction with SO2. The formation and decompn. of other intermediate compds. like (NH4) 2SnOx (n = 2, x = 3 and n = 3, x = 6) results in the same decompn. products (S, SO2 and NH3) . Two basic iron sulfates, formed in different ratios during synthesizing expts. performed under N2 or in the presence of air, have been detected as solid intermediates which contain ammonium ions. The final decompn. product was proved to be a- Fe2O3 (mineral name hematite).
OriginalspracheEnglisch
Seiten (von - bis)493-502
Seitenumfang10
FachzeitschriftJournal of Thermal Analysis and Calorimetry: an international forum for thermal studies
Jahrgang132
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - Apr. 2018

ÖFOS 2012

  • 104003 Anorganische Chemie
  • 104026 Spektroskopie
  • 104017 Physikalische Chemie
  • 105113 Kristallographie

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