Preparation of nickel(II) complexes with 2,3-butanediamines and their thermal octahedral-square planar transformation.

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概要

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• The following nickel(II) complexes with <I>meso</I>- or <I>dl</I>-2,3-butanediamine (abbreviated to <I>meso</I>-bn and <I>dl</I>-hn, respectively) were prepared: [Ni(<I>meso</I>-bn)<SUB>3</SUB>]X<SUB>2</SUB>·2H<SUB>2</SUB>O, [Ni(<I>meso</I>-bn)<SUB>2</SUB>]X<SUB>2</SUB> and [Ni(H<SUB>2</SUB>O)<SUB>2</SUB>(<I>dl</I>-bn)<SUB>2</SUB>]X<SUB>2</SUB> (X=Cl, Br). It was found from the changes in the absorption spectra and magnetic susceptibilities that [Ni(<I>meso</I>-bn)<SUB>3</SUB>]X<SUB>2</SUB>·2H<SUB>2</SUB>O complexes, when heated to 188 (X=Cl) and to 233 °C (X=Br), respectively, undergo transformations from octahedral to square planar structures with the loss of two moles of lattice water and one mole of coordinated <I>meso</I>-bn. [Ni(H<SUB>2</SUB>O)<SUB>2</SUB>(<I>dl</I>-bn)<SUB>2</SUB>]X<SUB>2</SUB> complexes were similarly found to transform from octahedral to square planar structures at 120 (X=Cl) and at 110 °C (X=Br), respectively with the evolution of two moles of coordinated water. After this transformation, the resulting complexes underwent the inverse transformation from square planar to octahedral structure at 170 °C, without any weight change. The effect of the configurational difference between <I>meso</I>- and <I>dl</I>-hn on the formation of tris and bis(2,3-butanediamine) complexes is also discussed.

• 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 Pharmaceutical Science, School of Pharmacy, Hokuriku University

• Kyuno Eishin

  Department of Chemistry Faculty of Science Kanazawa University

• Tsuchiya Ryokichi

  Department of Chemistry, Faculty of Science, Kanazawa University

• Yoshikuni Tadatsugu

  Department of Chemistry, Faculty of Science, Kanazawa University

• Nishimoto Hideyuki

  Department of Chemistry, Faculty of Science, Kanazawa University

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