Abstract
Spectrophotometric, conductometric and potentiometric investigations of the formation of deep-red-tartrato-vanadate complexes by the reaction of metavanadate ions and tartaric acid are carried out. Unlike tartaric acid, tartrate ions form no complexes with metavanadate ions. Differently protonated species of 2 : 1 and 1 : 1 vanadium(V)-tartaric acid complexes are found to exist. Ultrazentrifuge method of molecular weight determination and salt-cryoscopic (glauber-salt-ice-eutectic mixture) data indicate that the 2 : 1 complex is a dimer and the 1 : 1 complex a monomer one. The complexes found are formulated and their structures in aqueous solution are discussed. Some tartratovanadates (V) of alkali and alkaline earth metals are prepared and their properties studied.
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