Vitamin C interaction with cobalt-ammine cations. Synthesis, spectroscopic and structural characterization of cobalt-pentammine and cobalt-tetrammine sugar complexes containing L-ascorbate anion |
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| Authors: | H A Tajmir-Riahi |
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| Institution: | 1. Research and Development Centre, Bharathiar University, Coimbatore 641 046, India;2. Department of Chemistry, Arignar Anna Government Arts & Science College, Karaikal 609605, India;3. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50–950 Wroclaw 2, Poland;4. School of Sciences and Humanities, Vel Tech University, Avadi, Chennai 600 062, India;5. Department of Physics, Sakarya University, Sakarya, Turkey;1. Jiyang College, ZheJiang A & F University, Zhu''Ji 311800, China;2. Key Laboratory of Chemical Utilization of Forestry Biomass of Zhejiang Province, Zhejiang A & F University, Zhejiang Province, 311300, China;3. Department of Chemical Engineering, Liaocheng University, 252059, China |
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| Abstract: | Interaction between Co(NH3)5Cl]Cl2, Co(NH3)4Cl2]Cl and L-ascorbic acid has been investigated in aqueous solution and solid complexes of the type Co(NH3)5 ascorbate]Cl2 X H2O and Co(NH3)4 ascorbate]Cl2 X 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)5 ascorbate]2+ cation via the ionized O3 oxygen atom and bidentately in Co(NH3)4 ascorbate]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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