Elsevier

Polyhedron

Volume 8, Issue 16, 1989, Pages 2023-2028
Polyhedron

Optical activity of compounds formed by ammino complexes of cobalt(III) and carbohydrates—II. d-arabinose complexes

https://doi.org/10.1016/S0277-5387(00)80498-2Get rights and content

Abstract

Two sugar-containing chiral complexes are formed by the reaction of cis-[Co(NH3)4(H2O)2]3+ and d-arabinose at pH 6. Complex I is a mixed valence cobalt(II)/cobalt(IH) paramagnetic species, whereas complex II is a mononuclear cobalt(III) complex. Their syntheses and characterization are described. Visible absorption spectra and IR spectra were recorded. Optical activity was measured via circular dichroism spectra and optical rotatory dispersion. Complex I undergoes anomerization in aqueous solution, the rate of this process being pH and chiral complex dependent. Complex II does not retain its optical activity in aqueous solution as a result of decomposition. Spectral data support the coordination scheme proposed for each complex.

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