Monodentate chromium(III) ascorbate complexes prepared via chromate reduction in THF

Zumreoglu-Karan B., Ay A. N., Unaleroglu C.

SYNTHESIS AND REACTIVITY IN INORGANIC AND METAL-ORGANIC CHEMISTRY, vol.32, no.6, pp.1071-1084, 2002 (SCI-Expanded) identifier identifier


Two new Cr(III)-ascorbate complexes, K[Cr(C6H7O6)(2)(OH)(2)-(H2O2)(2)].3H(2)O (1) and K-2[Cr(C6H7O6)(3)(OH)(2)(H2O)].-2H(2)O (1), have been prepared by reducing chromate with L-ascorbic acid in aqueous THF. The complexes have been characterized by various analytical and spectroscopic methods (UV/Vis, FTIR, C-13 NMR and EI MS) and by thermal and magnetic measurements. Experimental results indicated a distorted octahedral environment around the Cr(III) centers and the coordination mode of ascorbic acid has been shown to be monodentate through its O(3) atom by NMR studies. The analytical and spectroscopic data available allowed the proposal of structural formulae for (1) and (2).