The structure of ion-pairs of .LAMBDA.- and .DELTA.-[Co(en)3]3+ ions with L-tartrate and related anions as deduced from circular dichroism spectra.
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概要
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The circular dichroism (CD) spectra of optical antipodes of [Co(en)<SUB>3</SUB>]<SUP>3+</SUP> and [Co(pn)<SUB>3</SUB>]<SUP>3+</SUP> were measured in the presence of L-tartrate, L-tartranilate or related dicarboxylate ions. L-Tartrate(2−) ions gave a large and stereoselective effect on the CD spectra; the CD change was greater for the <I>Λ</I>-complex than for the <I>Δ</I>-complex. Hydrogen-L-tartrate(1−) and L-tartranilate(1−) ions also caused stereoselective CD changes. On the other hand, succinates-(2−) and L-malate(2−) ions gave small and non-stereoselective CD changes, and undissociated tartaric acid gave no CD change. From a comparison of the results, it was concluded that two hydroxyl and one carboxylate groups of the L-tartrate ion form hydrogen bonds with three N–H groups of the tris(diamine)cobalt(III) ion of the <I>lel</I> form.
- 公益社団法人 日本化学会の論文
著者
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Yamatera Hideo
Department of Chemistry, Faculty of Science, Nagoya University
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Fujita Miho
Department of Chemistry, Faculty of Science, Nagoya University
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