Cobalt(II) Complexes with Nitrilotriacetic Acid, Nitrilopropionicdiacetic Acid and Nitriloisopropionicdiacetic Acid

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概要

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• The following cobalt (III) complexes containing nitrilotriacetic acid (NTA), nitrolopropionicdiacetic acid (NPDA) and nitriloisopropionicdiacetic acid (NIPDA) were prepared: (NH<SUB>4</SUB>)<SUB>3</SUB>[Co-(nta)<SUB>2</SUB>]·2H<SUB>2</SUB>O (pink) (I), NH<SUB>4</SUB>[Co(Hnta)<SUB>2</SUB>]·2H<SUB>2</SUB>O (pale pink) (II), K<SUB>3</SUB>[Co(npda)<SUB>2</SUB>]·2H<SUB>2</SUB>O (pink) (III), K[Co(Hnpda)<SUB>2</SUB>]·3H<SUB>2</SUB>O (pale pink) (IV), [Co(npda)(<I>o</I>-phen)]·H<SUB>2</SUB>O (reddish violet) (V), [Co-(npda)(bipy)] (reddish violet) (VI), K[Co(OH)(nipda) (H<SUB>2</SUB>O)]·H<SUB>2</SUB>O (bluish violet) (VII) and [Co-(nipda) (<I>o</I>-phen)] (reddish violet) (VIII); where nta, npda, nipda, <I>o</I>-phen and bipy are the abbreviations of nitrilotriacetate-, nitrilopropionicdiacetate-, nitriloisopropionicdiacetate-ion, <I>o</I>-phenanthroline and 2,2′-bipyridyl, respectively. On the basis of electronic spectra, it was found that complexes I to IV have the <I>trans</I> form, while complexes V, VI and VIII have the <I>mer</I> form structure with respect to the nitrogen atoms in the coordinating ligands. Complex VII showed a dehydrationdimerization reaction on heating by "Derivatograph". Comparison of chemical and physical properties of the complexes with those of the corresponding chromium (III) complexes was made.

• 公益社団法人 日本化学会の論文

著者

• Uehara Akira

  Department Of Chemistry Faculty Of Science Kanazawa University

• Kyuno Eishin

  Department of Chemistry Faculty of Science Kanazawa University

• Tsuchiya Ryokichi

  Department of Chemistry, Faculty of Science, Kanazawa University

• Tachibana Mitsuo

  Department of Chemistry, Faculty of Science, Kanazawa University

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