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Thermal behavior of the coordination compound [Co(urea)6](NO3)2

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Abstract

The coordination compound [Co(urea)6](NO3)2 was synthesized and physico-chemically characterized. The thermal decomposition carried out in dynamic air and inert atmosphere under non-isothermal conditions has been investigated by means of combined thermogravimetry/mass spectrometry, X-ray diffraction, IR and UV-VIS spectroscopy as well as magnetic measurements. The course of the thermal decomposition starts with two-phase transitions (melting and a Oh→Tdconfiguration change of the Co2+ ion) and continues with seven mass loss steps. According to the thermogravimetric and magnetic investigations a dimeric compound, [Co(biuret)(NCO)]2(NO3)2, is assumed to arise. Up ~250°C, an oxohydroxide nitrate intermediate is formed and a gradual oxidation of the Co2+ ions is observed. At 550°C, Co3O4 with mean crystallite sizes of ~150 Ĺ is identified.

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Authors and Affiliations

  1. Institute of Physical Chemistry 'I. G.Murgulescu', Spl. Independenti number 202, Sector 6, Bucharest, Romania

    O. Carp & L. Patron

  2. Solid State Chemistry, University of Augsburg, Universitätstrasse 1, D-86159, Augsburg, Germany

    A. Reller

Authors
  1. O. Carp
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  2. L. Patron
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  3. A. Reller
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Carp, O., Patron, L. & Reller, A. Thermal behavior of the coordination compound [Co(urea)6](NO3)2 . Journal of Thermal Analysis and Calorimetry 73, 867–876 (2003). https://doi.org/10.1023/A:1025898917972

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