Preparation and absorption and circular dichroism spectra of cobalt(III) complexes with N,N,N',N'-tetrakis(2-aminoethyl)-1,2-ethanediamine,-1,3-propanediamine,-1,4-butanediamine,and -(R,R)- and -(R,S)- 2,4-pentanediamine.

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概要

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• Cobalt(III) complexes of new sexidentate ligands,<I>N</I>,<I>N</I>,<I>N</I>′,<I>N</I>′-tetrakis(2-aminoethyl)-1,3-propanediamine (ttn), -1,4-butanediamine (ttmd), and -(<I>R</I>,<I>R</I>)- and -(<I>R</I>,<I>S</I>)-2,4-pentanediamine (tptn) were prepared and resolved except the <I>RR</I>-tptn complex which formed the <I>Δ</I>-isomer stereoselectively. The monocyano complexes of <I>N</I>,<I>N</I>,<I>N</I>′,<I>N</I>′-tetrakis(2-aminoethyl)-1,2-ethanediamine (ten) and ttn, in which the ligands act as a quinquidentate, were also prepared. Absorption and CD spectra of these complexes and the known [Co(ten)]<SUP>3+</SUP> complex were compared with one another. The first d-d absorption bands of the sexidentate complexes, [Co(A)]<SUP>3+</SUP> are shifted to smaller wave numbers in the order, ttn>ten>ttmd for A, but those of [Co(CN)(HA)]<SUP>3+</SUP> are in the reverse order, ten>ttn. The d-d absorption bands of [Co(<I>RS</I>-tptn)]<SUP>3+</SUP> which contains one axial methyl group show the remarkable red shift and the hyperchromic effect as compared with those of [Co(<I>RR</I>-tptn)]<SUP>3+</SUP> with two equatorial methyl groups.

• 公益社団法人 日本化学会の論文

著者

• Kashiwabara Kazuo

  Department Of Chemistry Faculty Of Science Nagoya University

• Fujita Junnosuke

  Department of Chemistry Faculty of Science Osaka University

• Doh Myung-Ki

  Department of Chemistry, Faculty of Science, Nagoya University

• Hata Kazumasa

  Department of Chemistry, Faculty of Science, Nagoya University

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