The Pfeiffer Effect with Cinchoninium Ion as a Chiral Environment Substance

Katsuhiko Miyoshi, Yasushige Kuroda, Junko Takeda, Hay Ami Yoneda, Ichiro Takagi

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The Pfeiffer effect of tris(oxalato)chromate(III) was examined and compared with that of tris(1, 10-phenanthroline)cobalt(II) by using cinchoninium ion and some of its related chiral compounds as an environment substance in water as well as in several mixed solvents with water. It was proposed that [Cr(ox)3]3- ion attacks the environment substance through electrostatic interaction and is subject to the asymmetry around the C-8 atom of cinchoninium ion, while [Co(phen)3]2+ ion associates with cinchoninium ion through the hydrophobic interaction with the quinolyl group and is subject to the asymmetry around the C-9 atom. The rate of appearance of the Pfeiffer effect was also measured for the [Cr(ox)3]3- system. It was found that the inversion rate of one enantiomer enriched by the Pfeiffer effect is appreciably retarded by cinchoninium ion, while the other enantiomer is kinetically little affected by it. The same will hold for the corresponding [Co(phen)3]2+ system.

Original languageEnglish
Pages (from-to)1425-1429
Number of pages5
JournalInorganic Chemistry
Volume18
Issue number6
DOIs
Publication statusPublished - Jan 1 1979
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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