Cobalt(III) complexes of N,N′-bis(2(S)-aminopropyl)-1(R),2(R)-trans-1,2-diaminocyclohexane

Dong Il Lee, Moo Jin Jun

Research output: Contribution to journalArticle

Abstract

A novel optically active tetraamine ligand possessing four asymmetric centers, N,N′-bis(2(S)-aminopropyl-1(R),2(R)-trans-1,2-diaminocyclohexane (SRRS-apchxn) and its cobalt(III) complexes, [Co(SRRS-apchxn)X2]n+ (X=Cl-, H2O, X2 = CO32-) have been synthesized. This ligand has coordinated stereospecifically to the cobalt(III) ion to give only the Λ-uns-cis-(SS) isomer. A trans dichloro complex has been obtained via the stereospecific isomerization of Λ-uns-cis-(SS)-[Co(SRRS-apchxn)Cl2]+ to trans-(SS)-[Co(SRRS-apchxn)Cl2]+ in CH3OH-HCl medium. Ligand and complexes have been characterized by electronic absorption, 1H NMR, CD spectra, and also by elemental analysis. It is of interest that this is one of the few CoIII(N4)X2 type complex preparations, which produces such an uns-cis isomer with stereospecificity.

Original languageEnglish
Pages (from-to)786-790
Number of pages5
JournalBulletin of the Korean Chemical Society
Volume17
Issue number9
Publication statusPublished - 1996 Dec 1

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Cobalt
Ligands
Isomers
Isomerization
Nuclear magnetic resonance
Ions
Chemical analysis
1,2-cyclohexanediamine

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

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abstract = "A novel optically active tetraamine ligand possessing four asymmetric centers, N,N′-bis(2(S)-aminopropyl-1(R),2(R)-trans-1,2-diaminocyclohexane (SRRS-apchxn) and its cobalt(III) complexes, [Co(SRRS-apchxn)X2]n+ (X=Cl-, H2O, X2 = CO32-) have been synthesized. This ligand has coordinated stereospecifically to the cobalt(III) ion to give only the Λ-uns-cis-(SS) isomer. A trans dichloro complex has been obtained via the stereospecific isomerization of Λ-uns-cis-(SS)-[Co(SRRS-apchxn)Cl2]+ to trans-(SS)-[Co(SRRS-apchxn)Cl2]+ in CH3OH-HCl medium. Ligand and complexes have been characterized by electronic absorption, 1H NMR, CD spectra, and also by elemental analysis. It is of interest that this is one of the few CoIII(N4)X2 type complex preparations, which produces such an uns-cis isomer with stereospecificity.",
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Cobalt(III) complexes of N,N′-bis(2(S)-aminopropyl)-1(R),2(R)-trans-1,2-diaminocyclohexane. / Lee, Dong Il; Jun, Moo Jin.

In: Bulletin of the Korean Chemical Society, Vol. 17, No. 9, 01.12.1996, p. 786-790.

Research output: Contribution to journalArticle

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AB - A novel optically active tetraamine ligand possessing four asymmetric centers, N,N′-bis(2(S)-aminopropyl-1(R),2(R)-trans-1,2-diaminocyclohexane (SRRS-apchxn) and its cobalt(III) complexes, [Co(SRRS-apchxn)X2]n+ (X=Cl-, H2O, X2 = CO32-) have been synthesized. This ligand has coordinated stereospecifically to the cobalt(III) ion to give only the Λ-uns-cis-(SS) isomer. A trans dichloro complex has been obtained via the stereospecific isomerization of Λ-uns-cis-(SS)-[Co(SRRS-apchxn)Cl2]+ to trans-(SS)-[Co(SRRS-apchxn)Cl2]+ in CH3OH-HCl medium. Ligand and complexes have been characterized by electronic absorption, 1H NMR, CD spectra, and also by elemental analysis. It is of interest that this is one of the few CoIII(N4)X2 type complex preparations, which produces such an uns-cis isomer with stereospecificity.

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