Vitamin C interaction with cobalt-ammine cations

Add time:07/13/2019    Source:sciencedirect.com

Interaction between [Co(NH3)5ClSC]Cl2, [Co(NH3)4Cl2]CI and L-ascorbic acid has been investigated in aqueous solution and solid complexes of the type [Co(NH3)5ascorbate]Cl2·H2O and [Co(NH3)4ascorbate]Cl2·H2O have been isolated and characterized by 13C-NMR, FT-IR and electron absorption spectroscopy. Spectroscopic and other evidence suggested that the sugar anion binds monodentately in the [Co(NH3)5ascorbate]2+ cation via the ionized O3 oxygen atom and bidentately in [Co(NH3)4ascorbate] 2+ through the O1 and O4 oxygen atoms, resulting in a six-coordinate geometry around the CO(III) ion. The intermolecular sugar hydrogen-bonding network is perturbed upon sugar metalation and the sugar moiety shows a similar conformation to that of the sodium ascorbate compound in these series of cobalt-ammine complexes.

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