Synthesis and spectroscopic studies of cobalt(III) complexes of the chiral pendant-arm macrocycle N,N′,N″-tris[(2S)-2-hydroxypropyl]-1,4,7-triazacyclononane (H3L); crystal structure of the hydrogen-bridged dimer [CoLH3LCo][PF6]3
- 1 January 1989
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 5,p. 931-935
- https://doi.org/10.1039/dt9890000931
Abstract
The preparation of the chiral macrocyclic ligand N,N′,N″-tris[(2S)-2-hydroxypropyl]-1,4,7-triazacyclononane (H3L) by reaction of (S)-propylene oxide with 1,4,7-triazacyclononane is described. The ligand forms a complex with CoIII whose spectroscopic properties are markedly pH dependent. The crystal structure of the [PF6]– salt of the principal basic form of the complex has been determined and shows that the compound is a dimer, [CoLH3LCo][PF6]3. The spectroscopic properties, including the circular dichroism, of the complex in neutral, acidic and basic non-aqueous media are discussed.Keywords
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