Online coupled TG-FTIR and TG/DTA-MS analyses of the evolved gases from dichloro(thiourea) tin(II)

J. ános Madarász, Petra Bombicz, Masayuki Okuya, Shoji Kaneko, György Pokol

Research output: Article

18 Citations (Scopus)

Abstract

Identification and monitoring of gaseous species released during thermal decomposition of title compound 1, dichloro(thiourea) tin(II), Sn(tu)Cl 2, [thiourea (tu), (NH2)2C = S] in flowing air atmosphere have been carried out by both online coupled TG-FTIR and simultaneous TG/DTA-MS evolved gas analysis (EGA) instruments. The first gaseous products of 1, evolved from 170 °C, are cyanamide (NH 2CN), carbonyl sulphide (COS), carbon disulfide (CS2) and water (H2O). At 240 °C isothiocyanic acid (HNCS) becomes the main product, accompanied by CS2, hydrogen cyanide (HCN) and traces of hydrogen chloride (HCl) according to EGA-FTIR analysis. Ammonia (NH 3) occurs first only above 250 °C, while sulfur dioxide (SO 2) formation is not observed till 400 °C. Air oxidation products of tin sulphides and organic residues, such as SO2, carbon dioxide (CO2) and NH2CN, occur suddenly at 425 °C together with a very sharp exothermic heat effect. All species identified by FTIR gas cells are confirmed by mass spectrometry, except HNCS. Evolution of H 2S has not been observed at any stage of the degradation of 1 by either of the EGA methods.

Original languageEnglish
Pages (from-to)577-581
Number of pages5
JournalSolid State Ionics
Volume172
Issue number1-4 SPEC. ISS.
DOIs
Publication statusPublished - aug. 31 2004

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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