Chiral metal complexes. 10. The inversion of Λ-α-{dichloro[3R-methyl-1,6-di(2-pyridyl)-2,5-diazahexane]cobalt(III)} to a Δ-β isomer via an isolated Δ-β-dinitro intermediate

Jill A. Chambers, 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

Λ-α-{Dichloro[3R-methyl-1,6-di(2-pyridyl)-2,5-diazahexane]cobalt(III)}, Λ-α[Co(R-picpn)Cl2]+, reacts with nitrite ion in aqueous solution, inversion occurs and the main product is Δ-β-[Co(R-picpn)(NO2)2]+. This reaction is stereospecific in that only one of four possible Δ-β isomers forms. A small amount of Λ-α[Co(R-picpn)(NO2)2]ClO4 was isolated from the reaction solution. The Λ-α-diastereomer readily isomerizes to the favoured Δ-β form, the reaction being light-catalysed. Reaction of the isolated Δ-β-dinitro species with concentrated hydrochloric acid results in the stereospecific formation of one isomer of Δ-β[Co(R-picpn)Cl2]+. All of the complexes were investigated using circular dichroism and high resolution proton NMR methods.

Original languageEnglish
Pages (from-to)55-60
Number of pages6
JournalInorganica Chimica Acta
Volume81
Issue numberC
DOIs
Publication statusPublished - 1984

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