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

doi:10.1016/S0020-1693(00)83596-3

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 journal › Article › peer-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 language	English
Pages (from-to)	193-199
Number of pages	7
Journal	Inorganica Chimica Acta
Volume	88
Issue number	2
DOIs	https://doi.org/10.1016/S0020-1693(00)83596-3
Publication status	Published - 15 Sept 1984

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@article{0d83ae9d4de047fcbf6a5016fb3d4f1d,

title = "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",

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.",

author = "Chambers, {Jill A.} and Goodwin, {Terence J.} and Mulqi, {Moh'D W.} and Williams, {Peter A.} and Vagg, {Robert S.}",

year = "1984",

month = sep,

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doi = "10.1016/S0020-1693(00)83596-3",

language = "English",

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pages = "193--199",

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T1 - 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

AU - Chambers, Jill A.

AU - Goodwin, Terence J.

AU - Mulqi, Moh'D W.

AU - Williams, Peter A.

AU - Vagg, Robert S.

PY - 1984/9/15

Y1 - 1984/9/15

N2 - 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.

AB - 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.

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JO - Inorganica Chimica Acta

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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

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