Chiral metal complexes. 20. The Λ-β to Δ-α-[Co(edda)CO3]- inversion

Michael A. Cox; R. Huw Griffiths; Peter A. Williams; Robert S. Vagg

doi:10.1016/S0020-1693(00)87482-4

Chiral metal complexes. 20. The Λ-β to Δ-α-[Co(edda)CO3]- inversion

Michael A. Cox, R. Huw Griffiths, Peter A. Williams^*, Robert S. Vagg

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The Δ-α-and Λ-β- forms of [Co(edda)CO₃]^- have been isolated as crystalline diastereoisomeric salts of the cation Δ-[Co(en)₂(ox)]⁺. When each salt is dissolved in 1.0 F aqueous Na₂CO₃ at 25°C an isomeric equilibration process occurs between these species in which the Δ-α form predominates before the eventual racemisation of both anionic species. On proceeding to equilibrium the Λ-β-[Co(edda) CO₃]^- isomer is observed to invert its absolute configuration at the central metal ion in converting to the Δ-α stereoisomer. This is the first reported example of inversion-isomerisation involving the β → α transformation in a chiral complex containing a linear tetradentate.

Original language	English
Pages (from-to)	155-158
Number of pages	4
Journal	Inorganica Chimica Acta
Volume	103
Issue number	2
DOIs	https://doi.org/10.1016/S0020-1693(00)87482-4
Publication status	Published - 15 Sept 1985

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title = "Chiral metal complexes. 20. The Λ-β to Δ-α-[Co(edda)CO3]- inversion",

abstract = "The Δ-α-and Λ-β- forms of [Co(edda)CO3]- have been isolated as crystalline diastereoisomeric salts of the cation Δ-[Co(en)2(ox)]+. When each salt is dissolved in 1.0 F aqueous Na2CO3 at 25°C an isomeric equilibration process occurs between these species in which the Δ-α form predominates before the eventual racemisation of both anionic species. On proceeding to equilibrium the Λ-β-[Co(edda) CO3]- isomer is observed to invert its absolute configuration at the central metal ion in converting to the Δ-α stereoisomer. This is the first reported example of inversion-isomerisation involving the β → α transformation in a chiral complex containing a linear tetradentate.",

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T1 - Chiral metal complexes. 20. The Λ-β to Δ-α-[Co(edda)CO3]- inversion

AU - Cox, Michael A.

AU - Griffiths, R. Huw

AU - Williams, Peter A.

AU - Vagg, Robert S.

PY - 1985/9/15

Y1 - 1985/9/15

N2 - The Δ-α-and Λ-β- forms of [Co(edda)CO3]- have been isolated as crystalline diastereoisomeric salts of the cation Δ-[Co(en)2(ox)]+. When each salt is dissolved in 1.0 F aqueous Na2CO3 at 25°C an isomeric equilibration process occurs between these species in which the Δ-α form predominates before the eventual racemisation of both anionic species. On proceeding to equilibrium the Λ-β-[Co(edda) CO3]- isomer is observed to invert its absolute configuration at the central metal ion in converting to the Δ-α stereoisomer. This is the first reported example of inversion-isomerisation involving the β → α transformation in a chiral complex containing a linear tetradentate.

AB - The Δ-α-and Λ-β- forms of [Co(edda)CO3]- have been isolated as crystalline diastereoisomeric salts of the cation Δ-[Co(en)2(ox)]+. When each salt is dissolved in 1.0 F aqueous Na2CO3 at 25°C an isomeric equilibration process occurs between these species in which the Δ-α form predominates before the eventual racemisation of both anionic species. On proceeding to equilibrium the Λ-β-[Co(edda) CO3]- isomer is observed to invert its absolute configuration at the central metal ion in converting to the Δ-α stereoisomer. This is the first reported example of inversion-isomerisation involving the β → α transformation in a chiral complex containing a linear tetradentate.

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Chiral metal complexes. 20. The Λ-β to Δ-α-[Co(edda)CO3]- inversion

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