The Structure of Ion-pairs of Λ- and Δ-[Co(en)3]3+ Ions with l-Tartrate and Related Anions as Deduced from Circular Dichroism Spectra
- 1 May 1976
- journal article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 49 (5) , 1301-1303
- https://doi.org/10.1246/bcsj.49.1301
Abstract
The circular dichroism (CD) spectra of optical antipodes of [Co(en)3]3+ and [Co(pn)3]3+ 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 Λ-complex than for the Δ-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 lel form.This publication has 9 references indexed in Scilit:
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