Chiral metal complexes. 14. High resolution 1H NMR studies of β-[Co(2,5-diaza-3-methyl-1,6-di(2-pyridyl)hexane)(alaninate)]2+ and related 1,2-diaminoethane complexes

Jill A. Chambers, Terence J. Goodwin, Moh'D W. Mulqi, Peter A. Williams*, Robert S. Vagg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Several isomers of the complex [Co(R-picpn)-(ala)]2+ have been synthesized, where R-picpn is 2,5-diaza-3R-methyl-1,6,-di(2-pyridyl)hexane, and ala is the anion of R- or S-alanine. The isomers have been studied using circular dichroism and high resolution 1H nmr techniques. Of the 40 possible isomers accessible in this system only 5 are observed to form in aqueous solution from Λ-α-[Co(R-picpn)Cl2]+. Two contain R-ala, and three contain S-ala. Four of the isomers (or their mirror images) correspond to those which have been previously characterized using X-ray crystallographic methods. Several diastereomers are found to cocrystallize. Λ-α-[Co(R-picpn)Cl2]+ reacts with 1,2-diaminoethane to form one main isomer which has also been characterized spectroscopically. Extensive rearrangement of the Co(III) coordination sphere is found to take place in all reactions.

Original languageEnglish
Pages (from-to)193-199
Number of pages7
JournalInorganica Chimica Acta
Volume88
Issue number2
DOIs
Publication statusPublished - 15 Sep 1984

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