An NMR Study of Metal Complexes Containing Acetylacetone and Related Compounds. III. The Preparation and Determination of the Configurations of Cobalt(III) Complexes Containing <I>N</I>,<I>N</I>′-Ethylenebis(acetylacetonimine) and <I>N</I>,<I>N</I>′-Ethyl

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概要

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• A series of <I>cis</I>-β-form cobalt(III) complexes containing <I>N</I>,<I>N</I>′-ethylenebis(acetylacetonimine) dianion (baen) or <I>N</I>,<I>N</I>′-ethylenebis(salicylideneimine) dianion (salen) were prepared—<I>cis</I>-β-[Co(X)(Y)] and <I>cis</I>-β-[Co(X)(Z)]ClO<SUB>4</SUB>(where X=baen or salen, Y=anions of acetylacetone, benzoylacetone, 8-hydroxyquinoline, and Z= ethylenediamine, 1,10-dipyridyl, 1,10-phenanthroline). The synthetic methods and characterization data are given. Also prepared were a series of <I>trans</I>-form cobalt(III)-bean complexes—<I>trans</I>-[Co(X)(A)<SUB>2</SUB>]ClO<SUB>4</SUB> and <I>trans</I>-K[Co(X)(NO<SUB>2</SUB>)<SUB>2</SUB>] where X=baen, and A=ammonia, methylamine, pyridine, aniline). The isolation of only <I>cis</I>-β-form complexes in reactions between [Co(X)(H<SUB>2</SUB>O)<SUB>2</SUB>] and the bidentate ligands contrasts with the isolation of only <I>trans</I>-form ones in those between [Co(X)(H<SUB>2</SUB>O)<SUB>2</SUB>] and the monodentate ligands. This result was explained in terms of the relative stabilities of the three configurations of the coordinated baen and salen. On the basis of the configurational analysis, the relative stabilities of the three configurations were determined to be <I>trans</I>-planar form > <I>cis</I>-β form > <I>cis</I>-α form.

• 公益社団法人 日本化学会の論文

著者

• Fujii Yuki

  Department Of Chemistry Faculty Of Science Ibaraki University

• Takahashi Sozo

  Department of Chemistry, Ibaraki Technical College

• Ebina Fujio

  Department of Chemistry, College of General Education, The University of Tokyo

• Ebina Fujio

  Department of Chemistry, Ibaraki University

• Osawa Akio

  Department of Chemistry, Ibaraki University

• Furukawa Yoichiro

  Department of Chemistry, Ibaraki University

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