Circular dichroism spectra and absolute configurations of fac(NH3)-(Co(a)(gly)(NH3)3)n+-type complexes.
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概要
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Four complexes [Co(a)(gly)(NH<SUB>3</SUB>)<SUB>3</SUB>]<SUP>+</SUP> (a=CN<SUP>−</SUP>, NO<SUB>2</SUB><SUP>−</SUP>, NCS<SUP>−</SUP>, and N<SUB>3</SUB><SUP>−</SUP>) and a related [Co(NO<SUB>2</SUB>)(β-ala)(NH<SUB>3</SUB>)<SUB>3</SUB>]<SUP>+</SUP> complex have been prepared; they were characterized by the absorption spectra in the ultraviolet region. The <I>fac</I>(<I>NH</I><SUB>3</SUB>) isomers of these complexes have been optically resolved by column chromatography. The CD spectra of <I>fac</I>(<I>NH</I><SUB>3</SUB>)-[Co(H<SUB>2</SUB>O)(gly)(NH<SUB>3</SUB>)<SUB>3</SUB>]<SUP>2+</SUP> and <I>fac</I>(<I>NH</I><SUB>3</SUB>)-[Co(H<SUB>2</SUB>O)(β-ala)(NH<SUB>3</SUB>)<SUB>3</SUB>]<SUP>2+</SUP> have also been measured. The absolute configurations of the <I>fac</I>(<I>NH</I><SUB>3</SUB>) isomers have been determined by referring to the CD spectrum of <I>fac</I>(<I>NH</I><SUB>3</SUB>)-(−)<SUB>589</SUB>[Co(NO<SUB>2</SUB>)(gly)(NH<SUB>3</SUB>)<SUB>3</SUB>]ClO<SUB>4</SUB> which had been subjected to an X-ray analysis. Each isomer has exhibited a dominant Cotton peak at <I>ca.</I> 20000 cm<SUP>−1</SUP> in the first absorption band region. The peak has been assigned to the electronic transition component which arises in the plane containing the glycinate chelate. The CD spectra <I>fac</I>(<I>NH</I><SUB>3</SUB>)-[Co(a)(gly)(NH<SUB>3</SUB>)<SUB>3</SUB>]<SUP>+</SUP> have been compared with those of the corresponding [Co(a)(gly)(1,4,7-triazacyclononane)]<SUP>+</SUP> complexes, and the sources of the optical activities in these complexes have been investigated.
- 公益社団法人 日本化学会の論文
著者
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Hattori Akihiko
Department Of Applied Physics Osaka City University:(prsent Address)hitachi Ltd.
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Fujinami Shuhei
Department Of Chemical Science Graduate School Of Natural Science And Technology Kanazawa University
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Shibata Muraji
Department of Chemistry Faculty of Science Kanazawa University
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Hattori Akihiko
Department of Chemistry, Faculty of Science, Kanazawa University
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Shibata Muraji
Department of Chemistry, Faculty of Science, Kanazawa University
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