Skip to main content
SpringerLink
Log in

Reaction scheme in the non-isothermal decomposition of (C6H5NH3)4Mo8O26 · 2 H2O

  • Published:
Journal of thermal analysis Aims and scope Submit manuscript

Abstract

The thermogravimetric decomposition of anilinum octamolybdate has been studied under non-isothermal conditions to elucidate the chemical reactions taking place in the first step of decomposition of the anhydrous compound.

The decomposition products were analyzed by gas-liquid chromatography, gas chromatography-mass spectrometry (GC/MS), infrared spectroscopy and X-ray powder diffraction.

The main decomposition product of aniline turned out to be indole, which is different from the major product in the isothermal decomposition at the same temperature, i.e. N-ethyl-aniline.

A dehydrocyclization reaction is suggested as the rate-dependent process. This is probably due to the catalytic effect of the octamolybdate anion.

Zusammenfassung

Die thermische Zersetzung von Anilinoctamolybdat wurde unter nicht-isothermen Bedingungen thermogravimetrisch untersucht, um die im ersten Zersetzungsschritt der wasserfreien Verbindung verlaufenden chemischen Reaktionen aufzuklären. Die Zersetzungsprodukte wurden mittels Gas-Flüssigkeits-Chromatographie, Gaschromatographie-Massenspektrometrie (GC/MS), Infrarotspektroskopie und Röntgendiffraktometrie analysiert. Als Hauptprodukt der Zersetzung von Anilin wurde Indol gefunden, während bei isothermer Zersetzung bei gleicher Temperatur vorwiegend N-Äthylanilin entsteht. Es wird angenommen, daß beim nicht-isothermen Prozeß eine wahrscheinlich durch das Octamolybdat katalysierte Dehydrocyclisierungsreaktion verläuft.

Резюме

В неизотермических у словиях проведено термогравиметричес кое разложение октамолибдата анили ния с целью выяснения химических реакций, протекающих на первой стадии разложения бе зводного соединения. Анализ продуктов разложени я проведен методом газо-жидкостной хром атографии, методом га зовая хроматография-масс-с пектрометрия, ИК спектроскопией и п орошковой рентгеног рафией. Основным продуктом р азложения анилина являлся индо л, тогда как при изотер мическом разложении-N-этилани лин. Для процесса обра зования индола предл ожена реакция дегидроцикл изации, которая возможно, вызвана кат алитическим действи ем октамолибдат-аниона.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. M. Martinez, A. Irabien, A. R. Arnaiz and C. Santiago, J. Thermal Anal. (in press).

  2. A. B. Kiss, T. Németh and E. Szalánczy, J. Wat. Sci., 13 (1978) 2541.

    Google Scholar 

  3. A. R. Arnaiz, Doctoral Thesis. U. País Vasco, Bilbao, 1983.

    Google Scholar 

  4. J. Chojnacka, E. Hodorowickz and S. Sagnowski, J. Inorg. Nucl. Chem., 38 (1976) 1811.

    Article  Google Scholar 

  5. E. Pretsch, T. Clerc, J. Seibl and W. Simon, Tablas de elucidación estructural de compuestos orgánicos por métodos espectroscópicos (Structural elucidation tables for organic compounds), Ed. Alhambra, 1980.

  6. R. M. Silverstein, G. Clayton and T. C. Morrill, Identificación Espectroscópica de compuestos orgánicos (Spectrometric identification of organic compounds), Diana, 1980.

  7. S. R. Heller and G. W. A. Milne, EPANIH. Mass Spectral date Base, US. Wah., 1978.

  8. C. Hansch, G. Helmkamp, J. Am. Chem. Soc., 73 (1951) 3080.

    Article  Google Scholar 

  9. A. Baeyer and H. Caro, Ber., 10 (1877) 692.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Química General, F. Químicas, U. Complutense M., Spain

    M. Martinez

  2. Dpto. Q. Técnica, F. Ciencias, U. País Vasco, Spain

    A. Irabien

  3. Dpto. Química, F. Ciencias, U. País Vasco, Apdo. 644, Bilbao, Spain

    A. R. Arnaiz & C. Santiago

Authors
  1. M. Martinez
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. Irabien
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. A. R. Arnaiz
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. C. Santiago
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Martinez, M., Irabien, A., Arnaiz, A.R. et al. Reaction scheme in the non-isothermal decomposition of (C6H5NH3)4Mo8O26 · 2 H2O. Journal of Thermal Analysis 29, 589–596 (1984). https://doi.org/10.1007/BF01913468

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01913468

Keywords

Search

Navigation