N.m.r. studies of complexes of molybdenum(VI) with tartaric acid in aqueous solution |
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Authors: | Ana M. V. S. V. Cavaleiro Victor M. S. Gil Julio D. Pedrosa de Jesus Robert D. Gillard Peter A. Williams |
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Affiliation: | (1) Department of Chemistry, University of Aveiro, Aveiro, Portugal;(2) Department of Chemistry, University College, P.O. Box 78, CF1 1XL Cardiff, Wales, UK;(3) Present address: Department of Chemistry, University of Coimbra, Coimbra, Portugal |
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Abstract: | Summary Complex formation between molybdate ions and R,R-(+)-tartaric acid has been studied in aqueous solution, and to a limited extent in DMSO, over a range of concentrations and pH at 298K, using1H and13C n.m.r. techniques. Only four main species are evident; two, which have Mo: L ratios of 11 and 12, are bondedvia a carboxylic oxygen atom and an adjacent hydroxyl oxygen atom. The 12 species forms stereospecifically. The other two main species contain bridging tartaric acid molecules, and a 22 species, also formed stereo-specifically in solution, have been isolated and characterised in the solid state. A limited number of experiments with racemic acid and meso-tartaric acid indicate that only a few species are formed in these systems and with a good deal of stereospecificity also. |
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