The Thermal Decomposition Products of Several Cobalt(III) Complexes Coordinated with Ethylenediaminetetraacetate

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Other Title
  • エチレンジアミン四酢酸イオンを配位した数種コバルト(III)錯体の熱分解生成物

Description

Thermal decomposition reactions were investigated for the following eight cobalt (III) complexes coordinated with ethylenediaminetetraacetate (edta) K[Co(edta)]2H20, Na[CoBr(Hedta)]2H20, Na2[CoCl (edta)]2H20, Na[Co(NO2) (Hedta)]2H20, Na2[CoBr(edta)]3H20, Na2[C0Cl(edta)]6H20, H [CoBr(Hedta)]2H20 and H[CoCl(Hedta)]2H20. Central Co (III) ions were reduced to Co (II) ions by the decomposition reactions. The products obtained under the experimental conditions shown in Table 1 were reoxidized to Co (III) complexes, which were separated into -1, 0 and + 1 charged species by an ion exchange chromatographic technique. The -1 charged species was identified as Co(edta)-. It was found that the non-charged species was composed of Co (III) complexes coordinated with ethylenediamine-N, NiNitriacetate (edtra) and/or N-methyl-substituted edtra as ligand (s), and that the +1 charged species was composed of the complexes coordinated with ethylenediaminediacetate (edda) and/ or N-methyl-substituted edda as ligand (s). Product distribution is summarized in Table 3. Nearly 50% of EDTA remained unchanged even after the complete reduction of CoM ions to Co(III) ions. This result suggests that an intermolecular electron transfer path contributes to the thermal decomposition reaction. The occurrence of so-called thermal chelation was also examined for each complex.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1978 (3), 377-381, 1978-03-10

    The Chemical Society of Japan

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