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- W4248898907 abstract "The electroreduction of niobium(V) in concentrated solutions of hydrochloric acid was studied by stirred-pool controlled-potential chronoamperometry and coulometry. In dilute solutions, niobium(V) is monomeric and is reduced stepwise to niobium(IV) and niobium(II), which react to form niobium(III). In more concentrated (10 m F ) solutions, niobium(V) is dimeric, and is initially reduced to [Nb(V)Nb(IV)], which can exist in three hydrolytic forms. Only one of these forms is further reduced to [Nb(IV)] 2 . The latter may dissociate or disproportionate to form [Nb(V)nb(III)], which can be reduced to [Nb(IV)Nb(III)] and, at more negative potentials, to Nb(III) and Nb(II). At very negative potentials, [Nb(IV)] 2 is reduced to [Nb(IV)Nb(II)], which decomposes rapidly to form two Nb(III) ions. Niobium(II) can be oxidized to a mixture of niobium(III) and (V), while niobium(III) is oxidized entirely to niobium(V). The dimeric species are probably joined by two oxygen bridges and an intermetallic bond. The latter permits the rapid disproportionation of [Nb(IV)] 2 and [Nb(IV)Nb(II)], and may stabilized [Nb(V)Nb(IV)], [Nb(V)Nb(III)] and [Nb(IV)Nb(III)] against dissociation." @default.
- W4248898907 created "2022-05-12" @default.
- W4248898907 creator A5055322798 @default.
- W4248898907 date "1968-10-01" @default.
- W4248898907 modified "2023-09-30" @default.
- W4248898907 title "The electroreduction of niobium(V) in hydrochloric acid solutions at mercury electrodes II. Controlled-potential coulometry and stirred-pool chronoamperometry" @default.
- W4248898907 doi "https://doi.org/10.1016/0368-1874(68)85037-3" @default.
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