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ABSTRACT
Two new Cr(III)-ascorbate complexes, K[Cr(C6H7O6)2(OH)2-(H2O2)2]·3H2O (1) and K2[Cr(C6H7O6)3(OH)2(H2O)]·2H2O (2), 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, 13C 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).
ACKNOWLEDGMENTS
This work constitutes a part of a research project (no. 1692) granted by Turkish Scientific and Technological Research Council. The authors are grateful to Dr. İ. Akşahin for the skillful recording of NMR spectra and to Prof. T. Firat for magnetic susceptibility measurements.